IB/rdmvat: Fix double vfree() in rvt_create_qp() error path

The unwind logic for creating a user QP has a double vfree
of the non-shared receive queue when handling a "too many qps"
failure.

The code unwinds the mmmap info by decrementing a reference
count which will call rvt_release_mmap_info() which in turn
does the vfree() of the r_rq.wq.  The unwind code then does
the same free.

Fix by guarding the vfree() with the same test that is done
in close and only do the vfree() if qp->ip is NULL.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rdmavt/qp.c

@@ -873,6 +873,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
 	free_qpn(&rdi->qp_dev->qpn_table, qp->ibqp.qp_num);
 
 bail_rq_wq:
+	if (!qp->ip)
 		vfree(qp->r_rq.wq);
 
 bail_driver_priv: