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/net/can/proc.c b/net/can/proc.c
index 3b6dd31..ae56690 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -397,7 +397,7 @@
 	int i;
 	int all_empty = 1;
 
-	/* check wether at least one list is non-empty */
+	/* check whether at least one list is non-empty */
 	for (i = 0; i < 0x800; i++)
 		if (!hlist_empty(&d->rx_sff[i])) {
 			all_empty = 0;