fix error logging for GSUP route

The addr may not be nul terminated.

Change-Id: Ie4def16008af573ed2e1367d9da50c3d2b5a71ef
diff --git a/src/gsup_send.c b/src/gsup_send.c
index 889cf63..247a7e7 100644
--- a/src/gsup_send.c
+++ b/src/gsup_send.c
@@ -42,7 +42,7 @@
 
 	conn = gsup_route_find(gs, addr, addrlen);
 	if (!conn) {
-		DEBUGP(DLGSUP, "Cannot find route for addr %s\n", addr);
+		DEBUGP(DLGSUP, "Cannot find route for addr %s\n", osmo_quote_str((const char*)addr, addrlen));
 		msgb_free(msg);
 		return -ENODEV;
 	}