Correct some spelling and add codespell config file

In one case, renamed a variable from `larg` which codespell thought was
a typo for `large`.

Closes #1411

.codespellrc

@@ -0,0 +1,3 @@
+[codespell]
+skip = strerror.c,AUTHORS
+ignore-words-list = numer,ser,xwindows

README.git

@@ -11,7 +11,7 @@ configure with a default set of options, and will therefore generate a Makefile,
 whereas the latter does not invoke configure at all. If using autogen.sh, note
 that you can also append options, that will be passed as is to configure.
 
-OS X-specific notes:
+macOS-specific notes:
 -------------------
 
 Starting with Xcode 4.3, neither Xcode.app nor the Xcode 'command line tools'

libusb/libusb.h

@@ -1501,7 +1501,7 @@ enum libusb_option {
 
 #define LIBUSB_OPTION_WEAK_AUTHORITY LIBUSB_OPTION_NO_DEVICE_DISCOVERY
 
-	/** Set the context log callback functon.
+	/** Set the context log callback function.
 	 *
 	 * Set the log callback function either on a context or globally. This
 	 * option must be provided an argument of type libusb_log_cb. Using this

libusb/os/sunos_usb.c

@@ -82,7 +82,7 @@ static int sunos_usb_ioctl(struct libusb_device *dev, int cmd);
 
 static int sunos_get_link(di_devlink_t devlink, void *arg)
 {
-	walk_link_t *larg = (walk_link_t *)arg;
+	walk_link_t *link_arg = (walk_link_t *)arg;
 	const char *p;
 	const char *q;
 
@@ -112,21 +112,21 @@ static int sunos_get_link(di_devlink_t devlink, void *arg)
 static int sunos_physpath_to_devlink(
 	const char *node_path, const char *match, char **link_path)
 {
-	walk_link_t larg;
+	walk_link_t link_arg;
 	di_devlink_handle_t hdl;
 
 	*link_path = NULL;
-	larg.linkpp = link_path;
+	link_arg.linkpp = link_path;
 	if ((hdl = di_devlink_init(NULL, 0)) == NULL) {
 		usbi_dbg(NULL, "di_devlink_init failure");
 		return (-1);
 	}
 
-	larg.len = strlen(node_path);
-	larg.path = (char *)node_path;
+	link_arg.len = strlen(node_path);
+	link_arg.path = (char *)node_path;
 
 	(void) di_devlink_walk(hdl, match, NULL, DI_PRIMARY_LINK,
-	    (void *)&larg, sunos_get_link);
+	    (void *)&link_arg, sunos_get_link);
 
 	(void) di_devlink_fini(&hdl);
 
@@ -624,7 +624,7 @@ sunos_add_devices(di_devlink_t link, void *arg)
 			}
 			if (usbi_sanitize_device(dev) < 0) {
 				libusb_unref_device(dev);
-				usbi_dbg(NULL, "sanatize failed: ");
+				usbi_dbg(NULL, "sanitize failed: ");
 				return (DI_WALK_TERMINATE);
 			}
 		} else {

libusb/version_nano.h

@@ -1 +1 @@
-#define LIBUSB_NANO 11870
+#define LIBUSB_NANO 11871

tests/init_context.c

@@ -58,7 +58,7 @@ static int unsetenv(const char *env) {
   } while (0)
 
 /**
- * Use relational operatator to compare two values and fail the test if the
+ * Use relational operator to compare two values and fail the test if the
  * comparison is false. Intended to compare integer or pointer types.
  *
  * Example: LIBUSB_EXPECT(==, 0, 1) -> fail, LIBUSB_EXPECT(==, 0, 0) -> ok.

tests/macos.c

@@ -51,7 +51,7 @@
   } while (0)
 
 /**
- * Use relational operatator to compare two values and fail the test if the
+ * Use relational operator to compare two values and fail the test if the
  * comparison is false. Intended to compare integer or pointer types.
  *
  * Example: LIBUSB_EXPECT(==, 0, 1) -> fail, LIBUSB_EXPECT(==, 0, 0) -> ok.

tests/set_option.c

@@ -66,7 +66,7 @@ static int setenv(const char *env, const char *value, int overwrite) {
   } while (0)
 
 /**
- * Use relational operatator to compare two values and fail the test if the
+ * Use relational operator to compare two values and fail the test if the
  * comparison is false. Intended to compare integer or pointer types.
  *
  * Example: LIBUSB_EXPECT(==, 0, 1) -> fail, LIBUSB_EXPECT(==, 0, 0) -> ok.

tests/umockdev.c

@@ -89,7 +89,7 @@ typedef struct {
 	GList *flying_urbs;
 	GList *discarded_urbs;
 
-	/* GMutex confuses tsan unecessarily */
+	/* GMutex confuses TSan unnecessarily */
 	pthread_mutex_t mutex;
 } UMockdevTestbedFixture;
 
@@ -245,7 +245,7 @@ handle_ioctl_cb (UMockdevIoctlBase *handler, UMockdevIoctlClient *client, UMockd
 	ioctl_arg = umockdev_ioctl_client_get_arg (client);
 
 	/* NOTE: We share the address space, dereferencing pointers *will* work.
-	 * However, to make tsan work, we still stick to the API that resolves
+	 * However, to make TSan work, we still stick to the API that resolves
 	 * the data into a local copy! */
 
 	switch (request) {
@@ -432,7 +432,7 @@ test_fixture_setup_libusb(UMockdevTestbedFixture * fixture, int devcount)
 
 	libusb_init_context(/*ctx=*/&fixture->ctx, /*options=*/NULL, /*num_options=*/0);
 
-	/* Supress global log messages completely
+	/* Suppress global log messages completely
 	 * (though, in some tests it might be interesting to check there are no real ones).
 	 */
 	libusb_set_log_cb (NULL, log_handler_null, LIBUSB_LOG_CB_GLOBAL);