[Bug 730559] dmabuf: fix checking mmap flags

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730559
  GStreamer | gst-plugins-base | git

--- Comment #3 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-06-04 14:03:39 UTC ---
Thanks for this patch. As said, it's clearly correct way of checking it's a
subset of prot, otherwise it conly check that at least one of the flags is
there, and may fail if none are there.

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