core: fix serial error #defines

Should have ERROR in them.

plugins/mm-modem-hso.c

@@ -300,7 +300,7 @@ hso_connect_timed_out (gpointer data)
 
     if (info) {
         info->error = g_error_new_literal (MM_SERIAL_ERROR,
-                                           MM_SERIAL_RESPONSE_TIMEOUT,
+                                           MM_SERIAL_ERROR_RESPONSE_TIMEOUT,
                                            "Connection timed out");
     }
 

plugins/mm-modem-mbm.c

@@ -405,11 +405,9 @@ mbm_emrdy_done (MMAtSerialPort *port,
     MMCallbackInfo *info = user_data;
     MMModemMbmPrivate *priv = MM_MODEM_MBM_GET_PRIVATE (info->modem);
 
-    if (   error
-        && error->domain == MM_SERIAL_ERROR
-        && error->code == MM_SERIAL_RESPONSE_TIMEOUT) {
+    if (g_error_matches (error, MM_SERIAL_ERROR, MM_SERIAL_ERROR_RESPONSE_TIMEOUT))
         g_warning ("%s: timed out waiting for EMRDY response.", __func__);
-    } else
+    else
         priv->have_emrdy = TRUE;
 
     do_init (port, info);

plugins/mm-modem-zte.c

@@ -371,7 +371,7 @@ pre_init_done (MMAtSerialPort *port,
     if (error) {
         /* Retry the init string one more time; the modem sometimes throws it away */
         if (   !priv->init_retried
-            && g_error_matches (error, MM_SERIAL_ERROR, MM_SERIAL_RESPONSE_TIMEOUT)) {
+            && g_error_matches (error, MM_SERIAL_ERROR, MM_SERIAL_ERROR_RESPONSE_TIMEOUT)) {
             priv->init_retried = TRUE;
             enable_flash_done (MM_SERIAL_PORT (port), NULL, user_data);
         } else