rpc: fix a routine to destory RDMA qp(queue-pair)

    This is backport of https://review.gluster.org/#/c/17249/

Problem: If an error has occured with rdma_create_id() in gf_rdma_connect(),
         process will jump to the 'unlock' label and then call gf_rdma_teardown()
         which call __gf_rdma_teardown().
         Presently, __gf_rdma_teardown() checks InifiniBand QP with peer->cm_id->qp!
         Unfortunately, cm_id is not allocated and will be crushed in this situation :)

Solution: If 'this->private->peer->cm_id' member is null, do not check
          'this->private->peer->cm_id->qp'.

> Change-Id: Ie321b8cf175ef4f1bdd9733d73840f03ddff8c3b
> BUG: 1449495
> Signed-off-by: Ji-Hyeon Gim <potatogim@potatogim.net>
> Reviewed-on: https://review.gluster.org/17249
> Reviewed-by: Amar Tumballi <amarts@redhat.com>
> Reviewed-by: Prashanth Pai <ppai@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Tested-by: Ji-Hyeon Gim
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Jeff Darcy <jeff@pl.atyp.us>

(cherry picked from commit ccfa06767f1282d9a3783e37555515a63cc62e69)

Change-Id: Ie321b8cf175ef4f1bdd9733d73840f03ddff8c3b
BUG: 1450565
Signed-off-by: Ji-Hyeon Gim <potatogim@gluesys.com>
Reviewed-on: https://review.gluster.org/17282
Smoke: Gluster Build System <jenkins@build.gluster.org>
Tested-by: Ji-Hyeon Gim
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Amar Tumballi <amarts@redhat.com>

0 files changed, 0 insertions, 0 deletions