btrfs: Cleanup: Remove objectid's init-value in create_reloc_inode()

objectid's init-value is not used in any case, remove it.
Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NChris Mason <clm@fb.com>

fs/btrfs/relocation.c

@@ -4144,7 +4144,7 @@ struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
 	struct btrfs_trans_handle *trans;
 	struct btrfs_root *root;
 	struct btrfs_key key;
-	u64 objectid = BTRFS_FIRST_FREE_OBJECTID;
+	u64 objectid;
 	int err = 0;
 
 	root = read_fs_root(fs_info, BTRFS_DATA_RELOC_TREE_OBJECTID);