fix compiler warning - return const string

daemon/call_interfaces.c

@@ -738,17 +738,14 @@ out:
 const char *call_offer_ng(bencode_item_t *input, struct callmaster *m, bencode_item_t *output, const char* addr,
 		const struct sockaddr_in6 *sin)
 {
-	static char *errstr[64]; memset(errstr,0,64);
-
 	if (m->conf.max_sessions>0) {
 		rwlock_lock_r(&m->hashlock);
 		if (g_hash_table_size(m->callhash) >= m->conf.max_sessions) {
 			rwlock_unlock_r(&m->hashlock);
-            atomic64_inc(&m->totalstats.total_rejected_sess);
-            atomic64_inc(&m->totalstats_interval.total_rejected_sess);
+			atomic64_inc(&m->totalstats.total_rejected_sess);
+			atomic64_inc(&m->totalstats_interval.total_rejected_sess);
 			ilog(LOG_ERROR, "Parallel session limit reached (%i)",m->conf.max_sessions);
-			snprintf(errstr, 64, "Parallel session limit reached (%i)",m->conf.max_sessions);
-			return errstr;
+			return "Parallel session limit reached";
 		}
 		rwlock_unlock_r(&m->hashlock);
 	}