bnxt_en: Fix compile warnings when CONFIG_INET is not set.

bnxt_gro_skb() has unused variables when CONFIG_INET is not set.  We
really cannot support hardware GRO if CONFIG_INET is not set, so
compile out bnxt_gro_skb() completely and define BNXT_FLAG_GRO to be 0
if CONFIG_INET is not set.  This will effectively always disable
hardware GRO if CONFIG_INET is not set.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -852,6 +852,7 @@ static inline struct sk_buff *bnxt_gro_skb(struct bnxt_tpa_info *tpa_info,
 					   struct rx_tpa_end_cmp_ext *tpa_end1,
 					   struct sk_buff *skb)
 {
+#ifdef CONFIG_INET
 	struct tcphdr *th;
 	int payload_off, tcp_opt_len = 0;
 	int len, nw_off;
@@ -866,7 +867,6 @@ static inline struct sk_buff *bnxt_gro_skb(struct bnxt_tpa_info *tpa_info,
 	if (TPA_END_GRO_TS(tpa_end))
 		tcp_opt_len = 12;
 
-#ifdef CONFIG_INET
 	if (tpa_info->gso_type == SKB_GSO_TCPV4) {
 		struct iphdr *iph;
 

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -855,7 +855,12 @@ struct bnxt {
 	#define BNXT_FLAG_DCB_ENABLED	0x1
 	#define BNXT_FLAG_VF		0x2
 	#define BNXT_FLAG_LRO		0x4
+#ifdef CONFIG_INET
 	#define BNXT_FLAG_GRO		0x8
+#else
+	/* Cannot support hardware GRO if CONFIG_INET is not set */
+	#define BNXT_FLAG_GRO		0x0
+#endif
 	#define BNXT_FLAG_TPA		(BNXT_FLAG_LRO | BNXT_FLAG_GRO)
 	#define BNXT_FLAG_JUMBO		0x10
 	#define BNXT_FLAG_STRIP_VLAN	0x20