Following the factoring out of the creation code udpate_space_info can
only be called for already-existing space_info structs. As such it
cannot fail.  Remove superfluous error handling and make the function
return void.
Signed-off-by: NNikolay Borisov <nborisov@suse.com>
Reviewed-by: NJeff Mahoney <jeffm@suse.com>
Reviewed-by: NLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>