mpathpersist command fails to add registration key on a device with zero registration/reservation keys.

Issue

• mpathpersist command fails to add registration key on a device with zero registration/reservation keys.

[root@hostname ~]# multipath -l|grep -A7 "36006016068b123456789abcdef7d0f0f"
36006016068b123456789abcdef7d0f0f dm-174 DGC,VRAID
size=20G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=active
| |- 11:0:2:153 sdni  71:320   active undef running
| `- 12:0:2:153 sdpp  130:496  active undef running
`-+- policy='service-time 0' prio=0 status=enabled
  |- 11:0:3:153 sdasw 130:1152 active undef running
  `- 12:0:3:153 sdatu 132:1024 active undef running

[root@hostname ~]# mpathpersist --in -k -d /dev/mapper/36006016068b123456789abcdef7d0f0f
  PR generation=0x0,    0 registered reservation key.
[root@hostname ~]# mpathpersist --out --register --param-sark=0xABC123 /dev/mapper/336006016068b123456789abcdef7d0f0f
persistent reserve out: scsi status: Reservation Conflict
PR out: command failed
[root@hostname ~]# mpathpersist --in -k -d /dev/mapper/36006016068b123456789abcdef7d0f0f
  PR generation=0x4,    0 registered reservation key.