[Bug 764902] Explicitly initialize GstVideoCropMeta fields to 0 on init.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764902

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Wim said we should always initialize all fields in the init function. So let's
merge the original patch and before that check if all init functions are doing
that.

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