btrfs: change return type to bool in btrfs_extent_readonly

btrfs_extent_readonly() checks if the block group is readonly, the bool
return type should be used.
Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com>
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/inode.c

@@ -7262,14 +7262,14 @@ static struct extent_map *btrfs_new_extent_direct(struct btrfs_inode *inode,
 	return em;
 }
 
-static int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr)
+static bool btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr)
 {
 	struct btrfs_block_group *block_group;
-	int readonly = 0;
+	bool readonly = false;
 
 	block_group = btrfs_lookup_block_group(fs_info, bytenr);
 	if (!block_group || block_group->ro)
-		readonly = 1;
+		readonly = true;
 	if (block_group)
 		btrfs_put_block_group(block_group);
 	return readonly;