[PATCH] vfree and kfree cleanup in drivers/

This patch does a full cleanup of 'NULL checks before vfree', and a partial
cleanup of calls to kfree for all of drivers/ - the kfree bit is partial in
that I only did the files that also had vfree calls in them.  The patch
also gets rid of some redundant (void *) casts of pointers being passed to
[vk]free, and a some tiny whitespace corrections also crept in.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/dm-exception-store.c

@@ -568,12 +568,9 @@ int dm_create_persistent(struct exception_store *store, uint32_t chunk_size)
 
       bad:
 	dm_io_put(sectors_to_pages(chunk_size));
-	if (ps) {
-		if (ps->area)
-			free_area(ps);
-
-		kfree(ps);
-	}
+	if (ps && ps->area)
+		free_area(ps);
+	kfree(ps);
 	return r;
 }