--- zzzz-none-000/linux-4.1.52/include/net/rtnetlink.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/net/rtnetlink.h	2022-03-02 11:37:13.000000000 +0000
@@ -17,7 +17,7 @@
 
 static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
 {
-	if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
+	if (nlmsg_len(nlh) >= (int)sizeof(struct rtgenmsg))
 		return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
 	else
 		return AF_UNSPEC;