pvrdma: release device resources in case of an error

pvrdma: release device resources in case of an error

If during pvrdma device initialisation an error occurs,
pvrdma_realize() does not release memory resources, leading
to memory leakage.

Reported-by: Li Qiang <liq3ea@163.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20181212175817.815-1-ppandit@redhat.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
(cherry picked from commit cce648613bc802be1b894227f7fd94d88476ea07)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>