bnx2x: Fix build with SRIOV disabled.

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c: In function 'bnx2x_drv_info_ether_stat':
drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c:3302:46: error: dereferencing pointer to incomplete type
make[6]: *** [drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.o] Error 1

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

@@ -3299,7 +3299,9 @@ static void bnx2x_drv_info_ether_stat(struct bnx2x *bp)
 	ether_stat->txq_size = bp->tx_ring_size;
 	ether_stat->rxq_size = bp->rx_ring_size;
 
+#ifdef CONFIG_BNX2X_SRIOV
 	ether_stat->vf_cnt = IS_SRIOV(bp) ? bp->vfdb->sriov.nr_virtfn : 0;
+#endif
 }
 
 static void bnx2x_drv_info_fcoe_stat(struct bnx2x *bp)