Fix misspellings of "whether" in comments.

"Whether" is misspelled in various comments across the tree; this
fixes them. No code changes.

Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index b7f45d4..87490ac 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -105,7 +105,7 @@
 #define WATCHDOG_NOWAYOUT_INIT_STATUS	0
 #endif
 
-/* Use the following function to check wether or not the watchdog is active */
+/* Use the following function to check whether or not the watchdog is active */
 static inline bool watchdog_active(struct watchdog_device *wdd)
 {
 	return test_bit(WDOG_ACTIVE, &wdd->status);