[NET_SCHED]: em_meta: fix compile warning

net/sched/em_meta.c: In function 'meta_int_vlan_tag':
net/sched/em_meta.c:179: warning: 'tag' may be used uninitialized in this function

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/em_meta.c

@@ -176,7 +176,7 @@ META_COLLECTOR(var_dev)
 
 META_COLLECTOR(int_vlan_tag)
 {
-	unsigned short tag;
+	unsigned short uninitialized_var(tag);
 	if (vlan_get_tag(skb, &tag) < 0)
 		*err = -1;
 	else