bna: remove useless pointer assignment

Pointer cmpl used to iterate through completion entries is updated at
the beginning of while loop as well as at the end. The update at the end
of the loop is useless.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bnad.c

@@ -725,7 +725,6 @@ next:
 			cmpl->valid = 0;
 			BNA_QE_INDX_INC(ccb->producer_index, ccb->q_depth);
 		}
-		cmpl = &cq[ccb->producer_index];
 	}
 
 	napi_gro_flush(&rx_ctrl->napi, false);