bnx2: no need to check before vfreeing

There is no need to check if a pointer is NULL before calling
vfree(), since vfree() function already check for it.
Signed-off-by: Breno Leitão <leitao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.c

@@ -546,7 +546,6 @@ bnx2_free_rx_mem(struct bnx2 *bp)
 						    rxr->rx_desc_mapping[j]);
 			rxr->rx_desc_ring[j] = NULL;
 		}
-		if (rxr->rx_buf_ring)
 		vfree(rxr->rx_buf_ring);
 		rxr->rx_buf_ring = NULL;
 
@@ -557,7 +556,6 @@ bnx2_free_rx_mem(struct bnx2 *bp)
 						    rxr->rx_pg_desc_mapping[j]);
 			rxr->rx_pg_desc_ring[j] = NULL;
 		}
-		if (rxr->rx_pg_ring)
 		vfree(rxr->rx_pg_ring);
 		rxr->rx_pg_ring = NULL;
 	}