v4l2: display stride and width values if stride is too small

https://bugzilla.gnome.org/show_bug.cgi?id=792596
diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index 8817f69..995c719 100644
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -3040,7 +3040,8 @@
 
   if (padded_width < format->fmt.pix.width)
     GST_WARNING_OBJECT (v4l2object->dbg_obj,
-        "Driver bug detected, stride is too small for the width");
+        "Driver bug detected, stride (%d) is too small for the width (%d)",
+        padded_width, format->fmt.pix.width);
 
   align->padding_right = padded_width - info->width - align->padding_left;