[PATCH] md/bitmap.c:bitmap_mask_state(): fix inconsequent NULL checking

We dereference bitmap both one line above and one line below this check
rendering this check quite useless.

Spotted by the Coverity checker.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/bitmap.c

@@ -556,7 +556,7 @@ static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits,
 	unsigned long flags;
 
 	spin_lock_irqsave(&bitmap->lock, flags);
-	if (!bitmap || !bitmap->sb_page) { /* can't set the state */
+	if (!bitmap->sb_page) { /* can't set the state */
 		spin_unlock_irqrestore(&bitmap->lock, flags);
 		return;
 	}