Warning notice with WP_DEBUG true

Hi there,

Nice plugin.But when adding a gallery image, its shows a warning message as undefine variable $k in code_gallery.php line number 197.

When I looked in the line no 197, I found a small bug in code_gallery.php with varible K which is out of scope in the function.So to get the variable in the scope, may be just define global $k inside the function.

My configuration wordpress 4.0.1, php 5.3.10.

Thanks.

https://wordpress.org/plugins/cpm-gallery/