router_transplant_queues: fix inversed logic, issue #204

An embarassing logic error caused queues from totally unrelated servers
to be swapped, causing all kinds of random erroneously delivered
metrics.

ChangeLog.md

@@ -16,6 +16,8 @@
   'include' directive doesn't care about rewrites.
 * [Issue #241](https://github.com/grobian/carbon-c-relay/issues/241)
   XXX characters being prepended to metrics when sent via UDP
+* [Issue #204](https://github.com/grobian/carbon-c-relay/issues/204)
+  relay is sending data randomly while kill -HUP happens
 
 
 # 2.3 (2016-11-07)

router.c

@@ -2695,7 +2695,7 @@ router_transplant_queues(router *new, router *old)
 
 	for (ns = new->srvrs; ns != NULL; ns = ns->next) {
 		for (os = old->srvrs; os != NULL; os = os->next) {
-			if (strcmp(server_ip(ns->server), server_ip(os->server)) &&
+			if (strcmp(server_ip(ns->server), server_ip(os->server)) == 0 &&
 					server_port(ns->server) == server_port(os->server) &&
 					server_ctype(ns->server) == server_ctype(os->server))
 			{