Btrfs: using for_each_set_bit_from to simplify the code

---
 fs/btrfs/free-space-cache.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
 
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 6b10acf..b107e68 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1454,9 +1454,7 @@ static int search_bitmap(struct btrfs_free_space_ctl *ctl,
 			  max_t(u64, *offset, bitmap_info->offset));
 	bits = bytes_to_bits(*bytes, ctl->unit);
 
-	for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i);
-	     i < BITS_PER_BITMAP;
-	     i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i + 1)) {
+	for_each_set_bit_from(i, bitmap_info->bitmap, BITS_PER_BITMAP) {
 		next_zero = find_next_zero_bit(bitmap_info->bitmap,
 					       BITS_PER_BITMAP, i);
 		if ((next_zero - i) >= bits) {
@@ -2307,9 +2305,7 @@ static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group,
 
 again:
 	found_bits = 0;
-	for (i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i);
-	     i < BITS_PER_BITMAP;
-	     i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) {
+	for_each_set_bit_from(i, entry->bitmap, BITS_PER_BITMAP) {
 		next_zero = find_next_zero_bit(entry->bitmap,
 					       BITS_PER_BITMAP, i);
 		if (next_zero - i >= min_bits) {