udmabuf: actually unmap the scatterlist
unmap_udmabuf fails to actually unmap the scatterlist, leaving dangling mappings around. Fixes: fbb0de79 ("Add udmabuf misc device") Signed-off-by: NLucas Stach <l.stach@pengutronix.de> Link: http://patchwork.freedesktop.org/patch/msgid/20190604202331.17482-1-l.stach@pengutronix.deSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>
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