btrfs: avoid reusing return variable in nested block in btrfs_lookup_bio_sums

The function btrfs_lookup_bio_sums() and a nested if statement declare
ret respectively as blk_status_t and int.

There is no need to store the return value of
search_file_offset_in_bio() to ret as this is a one-time call.
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAnand Jain <anand.jain@oracle.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/file-item.c

@@ -494,12 +494,11 @@ blk_status_t btrfs_lookup_bio_sums(struct btrfs_bio *bbio)
 			if (inode->root->root_key.objectid ==
 			    BTRFS_DATA_RELOC_TREE_OBJECTID) {
 				u64 file_offset;
-				int ret;
 
-				ret = search_file_offset_in_bio(bio,
-						&inode->vfs_inode,
-						cur_disk_bytenr, &file_offset);
-				if (ret)
+				if (search_file_offset_in_bio(bio,
+							      &inode->vfs_inode,
+							      cur_disk_bytenr,
+							      &file_offset))
 					set_extent_bits(io_tree, file_offset,
 						file_offset + sectorsize - 1,
 						EXTENT_NODATASUM);