liquidio: do not dereference pointer if it's NULL

Fix smatch errors by not dereferencing iq pointer if it's NULL.

See http://marc.info/?l=kernel-janitors&m=148637299004834&w=2

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/lio_main.c

@@ -2447,7 +2447,7 @@ static int liquidio_napi_poll(struct napi_struct *napi, int budget)
 
 	/* force enable interrupt if reg cnts are high to avoid wraparound */
 	if ((work_done < budget && tx_done) ||
-	    (iq->pkt_in_done >= MAX_REG_CNT) ||
+	    (iq && iq->pkt_in_done >= MAX_REG_CNT) ||
 	    (droq->pkt_count >= MAX_REG_CNT)) {
 		tx_done = 1;
 		napi_complete_done(napi, work_done);

drivers/net/ethernet/cavium/liquidio/lio_vf_main.c

@@ -1632,7 +1632,7 @@ static int liquidio_napi_poll(struct napi_struct *napi, int budget)
 
 	/* force enable interrupt if reg cnts are high to avoid wraparound */
 	if ((work_done < budget && tx_done) ||
-	    (iq->pkt_in_done >= MAX_REG_CNT) ||
+	    (iq && iq->pkt_in_done >= MAX_REG_CNT) ||
 	    (droq->pkt_count >= MAX_REG_CNT)) {
 		tx_done = 1;
 		napi_complete_done(napi, work_done);