mtd: use for_each_clear_bit()

Use for_each_clear_bit() to iterate over all the cleared bit in a
memory region.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mtd/chips/cfi_cmdset_0001.c

@@ -2526,12 +2526,10 @@ static void cfi_intelext_restore_locks(struct mtd_info *mtd)
 		if (!region->lockmap)
 			continue;
 
-		for (block = 0; block < region->numblocks; block++) {
+		for_each_clear_bit(block, region->lockmap, region->numblocks) {
 			len = region->erasesize;
 			adr = region->offset + block * len;
-
-			if (!test_bit(block, region->lockmap))
-				cfi_intelext_unlock(mtd, adr, len);
+			cfi_intelext_unlock(mtd, adr, len);
 		}
 	}
 }