[Bug 787442] kms: set buffer to NULL if allocation failed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787442

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 359399
  --> https://bugzilla.gnome.org/attachment.cgi?id=359399&action=edit
kms: set buffer to NULL if allocation failed

If bo allocation failed we destroy the buffer and return GST_FLOW_ERROR,
but the @buffer pointer was still pointing to the address of the
destroyed buffer. gst_kms_sink_copy_to_dumb_buffer() was then trying to
unref it when bailing out causing a crash.

Best to return NULL rather than an invalid pointer if the allocation
failed.

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