ublox/helpers: fix propagation of +URAT response parse error

The fallback error handling branch happens much too late, just leaking the
newly made GError instead of propagating.

src/plugins/ublox/mm-modem-helpers-ublox.c

@@ -1812,18 +1812,18 @@ mm_ublox_parse_urat_read_response (const gchar  *response,
         }
     }
 
+    if (!inner_error && allowed == MM_MODEM_MODE_NONE) {
+        inner_error = g_error_new (MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
+                                   "Couldn't parse +URAT response: %s", response);
+        goto out;
+    }
+
 out:
     if (inner_error) {
         g_propagate_error (error, inner_error);
         return FALSE;
     }
 
-    if (allowed == MM_MODEM_MODE_NONE) {
-        inner_error = g_error_new (MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
-                                   "Couldn't parse +URAT response: %s", response);
-        return FALSE;
-    }
-
     *out_allowed = allowed;
     *out_preferred = preferred;
     return TRUE;