net: Avoid compiler warning for mmsghdr when CONFIG_COMPAT is not selected

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/compat.h

@@ -33,7 +33,11 @@ extern int compat_sock_get_timestamp(struct sock *, struct timeval __user *);
 extern int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
 
 #else /* defined(CONFIG_COMPAT) */
-#define compat_msghdr	msghdr		/* to avoid compiler warnings */
+/*
+ * To avoid compiler warnings:
+ */
+#define compat_msghdr	msghdr
+#define compat_mmsghdr	mmsghdr
 #endif /* defined(CONFIG_COMPAT) */
 
 extern int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);