define and use 'enum MHD_Result'

src/testcurl/https/test_https_get_select.c

@@ -39,7 +39,7 @@ extern const char srv_self_signed_cert_pem[];
 
 static int oneone;
 
-static int
+static enum MHD_Result
 ahc_echo (void *cls,
           struct MHD_Connection *connection,
           const char *url,
@@ -51,7 +51,7 @@ ahc_echo (void *cls,
   static int ptr;
   const char *me = cls;
   struct MHD_Response *response;
-  int ret;
+  enum MHD_Result ret;
   (void) version; (void) upload_data; (void) upload_data_size;       /* Unused. Silent compiler warning. */
 
   if (0 != strcmp (me, method))