ignore clipTo offset if larger than frame count
ignore clipTo offset if larger than frame count

sending a too large clipTo offset could lead to a large initial alloc size
which in turn fails the request.
also prevent integer overflow in cur_count in case clipTo is very large

kaltura/nginx-vod-module,doublex/nginx-vod-module,BlackWizard/nginx-vod-module,BlackWizard/nginx-vod-module,doublex/nginx-vod-module,kaltura/nginx-vod-module,doublex/nginx-vod-module,BlackWizard/nginx-vod-module,BlackWizard/nginx-vod-module,kaltura/nginx-vod-module,kaltura/nginx-vod-module,doublex/nginx-vod-module,BlackWizard/nginx-vod-module,kaltura/nginx-vod-module,doublex/nginx-vod-module,doublex/nginx-vod-module,BlackWizard/nginx-vod-module,kaltura/nginx-vod-module