If the interrupt allocation failed we should start freeing the CQ rings
rather than unregistering the netdev notifier.

Fixes: 29c8d9eb ("IB: Add vmw_pvrdma driver")
Signed-off-by: Adit Ranadive <aditr@vmware.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>