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devip: don't pad the tag for routing commands (fixes removing routes with < 4 character tags)

--- a/sys/src/9/ip/devip.c

+++ b/sys/src/9/ip/devip.c

@@ -260,15 +260,10 @@

 newipaux(char *owner, char *tag)

 {

 	IPaux *a;

-	int n;

 	a = smalloc(sizeof(*a));

 	kstrdup(&a->owner, owner);

-	memset(a->tag, ' ', sizeof(a->tag));

-	n = strlen(tag);

-	if(n > sizeof(a->tag))

-		n = sizeof(a->tag);

-	memmove(a->tag, tag, n);

+	strncpy(a->tag, tag, sizeof(a->tag));

 	return a;

 }