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>

drivers/scsi/wd7000.c

@@ -161,7 +161,7 @@
  *
  * 2003/02/12 - Christoph Hellwig <hch@infradead.org>
  *
- * Cleaned up host template defintion
+ * Cleaned up host template definition
  * Removed now obsolete wd7000.h
  */