ip-link: remove warning message

the warning was:
iproute.c:301:12: warning: 'val' may be used uninitialized in this
function [-Wmaybe-uninitialized]
   features &= ~RTAX_FEATURE_ECN;
            ^
iproute.c:575:10: note: 'val' was declared here
   __u32 val;
	  ^
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>

ip/iproute.c

@@ -572,7 +572,7 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 			mxlock = *(unsigned*)RTA_DATA(mxrta[RTAX_LOCK]);
 
 		for (i=2; i<= RTAX_MAX; i++) {
-			__u32 val;
+			__u32 val = 0U;
 
 			if (mxrta[i] == NULL)
 				continue;