[util] Move variable closer to use

util/shape-consumer.hh

@@ -61,11 +61,11 @@ struct shape_consumer_t : shape_options_t
 
     for (unsigned int n = num_iterations; n; n--)
     {
-      const char *error = nullptr;
-
       populate_buffer (buffer, text, text_len, app.text_before, app.text_after);
       if (n == 1)
 	output.consume_text (buffer, text, text_len, utf8_clusters);
+
+      const char *error = nullptr;
       if (!shape (app.font, buffer, &error))
       {
 	failed = true;