btrfs: remove unused fs_info parameter

Since the commit c6100a4b ("Btrfs: replace tree->mapping with
tree->private_data"), parameter fs_info in alloc_reloc_control is
not used. So remove it.
Signed-off-by: NGu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: NNikolay Borisov <nborisov@suse.com>
Reviewed-by: NAnand Jain <anand.jain@oracle.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/relocation.c

@@ -4299,7 +4299,7 @@ struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
 	return inode;
 }
 
-static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
+static struct reloc_control *alloc_reloc_control(void)
 {
 	struct reloc_control *rc;
 
@@ -4366,7 +4366,7 @@ int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start)
 	int rw = 0;
 	int err = 0;
 
-	rc = alloc_reloc_control(fs_info);
+	rc = alloc_reloc_control();
 	if (!rc)
 		return -ENOMEM;
 
@@ -4562,7 +4562,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
 	if (list_empty(&reloc_roots))
 		goto out;
 
-	rc = alloc_reloc_control(fs_info);
+	rc = alloc_reloc_control();
 	if (!rc) {
 		err = -ENOMEM;
 		goto out;