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: Zhao Lei <zhaolei@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>