irdma(4): fix potential memory leak on qhash cqp operation

[bartosz.sobczak_intel.com]

Summary

It was found that in some circumstances when launching
non-waiting create qhash cqp operation the refcount on
the cqp_request may be not properly decremented leading to a memory
leak.

Sponsored by: Intel Corporation
Signed-off-by: Bartosz Sobczak <[e-mail]>

[anzhu_netapp.com]

Looks good to me. Thanks!

[kgalazka]

@kbowling, @erj Could you please take a look? I'd like to commit this when we get a green light from validation team.

[mateusz.moga_intel.com]

validation passed