don't overrun buffer (FSCORE-95)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7346 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_stun.c

@@ -198,7 +198,7 @@ SWITCH_DECLARE(char *) switch_stun_packet_attribute_get_username(switch_stun_pac
 {
 	uint16_t cpylen;
 
-	cpylen = attribute->length > len ? attribute->length : len;
+	cpylen = attribute->length < len ? attribute->length : len;
 	return memcpy(username, attribute->value, cpylen);
 }