Fix compilation on --enable-physdev-override

    CC [M]  /opt/tools/ipt-netflow/ipt_NETFLOW.o
  In file included from /opt/tools/ipt-netflow/ipt_NETFLOW.c:76:
  /opt/tools/ipt-netflow/compat.h:701:1: error: redefinition of ???nf_bridge_info_get???
   nf_bridge_info_get(const struct sk_buff *skb)
   ^~~~~~~~~~~~~~~~~~
  In file included from /opt/tools/ipt-netflow/ipt_NETFLOW.c:53:
  ./include/linux/netfilter_bridge.h:28:1: note: previous definition of ???nf_bridge_info_get??? was here
   nf_bridge_info_get(const struct sk_buff *skb)
   ^~~~~~~~~~~~~~~~~~
  In file included from /opt/tools/ipt-netflow/ipt_NETFLOW.c:76:
  /opt/tools/ipt-netflow/compat.h: In function ???nf_bridge_info_get???:
  /opt/tools/ipt-netflow/compat.h:703:14: error: ???const struct sk_buff??? has no member named ???nf_bridge???; did you mean ???nf_trace????
    return skb->nf_bridge;
		^~~~~~~~~
		nf_trace

Fixes: 8fe543c ("Fix compilation when CONFIG_BRIDGE_NETFILTER if undefined")
Reported-by: Artem Egorkin <artem@bonzo.me>

Author: aabc

compat.h

@@ -696,7 +696,7 @@ static inline int is_vlan_dev(struct net_device *dev)
 #endif
 
 #ifdef CONFIG_BRIDGE_NETFILTER
-# ifdef HAVE_NF_BRIDGE_INFO_GET
+# ifndef HAVE_NF_BRIDGE_INFO_GET
 static inline struct nf_bridge_info *
 nf_bridge_info_get(const struct sk_buff *skb)
 {