ares_init potential memory leak

If initializing using default settings fails, there may be a memory leak of
search domains that were set by system configuration.

Fixes Issue: #724
Fix By: Brad House (@bradh352)

src/lib/ares_init.c

@@ -261,31 +261,6 @@ static ares_status_t init_by_defaults(ares_channel_t *channel)
   }
 
 error:
-  if (rc) {
-    if (channel->domains && channel->domains[0]) {
-      ares_free(channel->domains[0]);
-    }
-    if (channel->domains) {
-      ares_free(channel->domains);
-      channel->domains = NULL;
-    }
-
-    if (channel->lookups) {
-      ares_free(channel->lookups);
-      channel->lookups = NULL;
-    }
-
-    if (channel->resolvconf_path) {
-      ares_free(channel->resolvconf_path);
-      channel->resolvconf_path = NULL;
-    }
-
-    if (channel->hosts_path) {
-      ares_free(channel->hosts_path);
-      channel->hosts_path = NULL;
-    }
-  }
-
   if (hostname) {
     ares_free(hostname);
   }