tree-wide: fix misspelling of "definition" in comments

"Definition" is misspelled "defintion" in several comments; this
patch 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/drivers/net/wireless/ath/ath5k/base.h b/drivers/net/wireless/ath/ath5k/base.h
index c79a650..4da0294 100644
--- a/drivers/net/wireless/ath/ath5k/base.h
+++ b/drivers/net/wireless/ath/ath5k/base.h
@@ -36,7 +36,7 @@
  */
 
 /*
- * Defintions for the Atheros Wireless LAN controller driver.
+ * Definitions for the Atheros Wireless LAN controller driver.
  */
 #ifndef _DEV_ATH_ATHVAR_H
 #define _DEV_ATH_ATHVAR_H