Dump reject file before mysqltest in 'die'

Makes it easier to see what happened before the failure

client/mysqltest.c

@@ -573,6 +573,8 @@ static void die(const char *fmt, ...)
 {
   va_list args;
   DBUG_ENTER("die");
+
+  /* Print the error message */
   va_start(args, fmt);
   if (fmt)
   {
@@ -587,6 +589,15 @@ static void die(const char *fmt, ...)
     fflush(stderr);
   }
   va_end(args);
+
+  /* Dump the result that has been accumulated so far to reject file */
+  if (result_file && ds_res.length)
+  {
+
+    reject_dump(result_file, ds_res.str, ds_res.length);
+  }
+
+  /* Clean up and exit */
   free_used_memory();
   my_end(MY_CHECK_ERROR);
   exit(1);