plugin_proxy: Plug a memory leak

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

src/flb_plugin_proxy.c

@@ -694,10 +694,22 @@ int flb_proxy_custom_cb_exit(void *custom_context,
     int ret = -1;
     struct flb_plugin_proxy_context *ctx = custom_context;
     struct flb_plugin_proxy *proxy = (ctx->proxy);
+    struct flb_plugin_proxy_def *def;
     if (!custom_context) {
         return ret;
     }
 
+    if (!proxy) {
+        return ret;
+    }
+
+    def = proxy->def;
+    if (def->name != NULL) {
+        flb_free(def->name);
+
+        def->name = NULL;
+    }
+
     if (proxy->def->proxy == FLB_PROXY_GOLANG) {
 #ifdef FLB_HAVE_PROXY_GO
         ret = proxy_go_custom_destroy(ctx);