proxy: do not leak dl handler on mem error

Signed-off-by: Eduardo Silva <[email protected]>

src/flb_plugin_proxy.c

@@ -161,6 +161,7 @@ struct flb_plugin_proxy *flb_plugin_proxy_create(const char *dso_path, int type,
  proxy = flb_malloc(sizeof(struct flb_plugin_proxy));
  if (!proxy) {
  flb_errno();
+ dlclose(handle);
  return NULL;
  }