[Bug 789952] fdmemory: need unmap if mapping flags are not subset of previous

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789952

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
The keep_map flag should be smarter, otherwise it's just a terribly friend. I
didn't know this flag was enabled for dmabuf, it's a bit unfortunate, since it
a total breakage of DMABuf usage. You must unmap if you don't implement
DMA_SYNC. I'm find that patch and revert.

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