[Bug 785029] kmssink: compute proper pitch and offset for multi planar formats

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785029

--- Comment #2 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 355760
  --> https://bugzilla.gnome.org/attachment.cgi?id=355760&action=edit
kmsallocator: use the actual maxsize of the allocated buffer

Use the actual size of the allocated DUMB buffer to GstMemory rather
than assuming it has exactly the requested size. It may be bigger
because of alignment constraints.

Also add a check to prevent overflow with buggy drivers.

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