drm/vgem: Simplify dumb_map
The offset manager already checks for existing offsets internally, while holding suitable locks. We can drop this check. v2: Fix title (Emil). Reviewed-by: NEmil Velikov <emil.l.velikov@gmail.com> Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1459330852-27668-11-git-send-email-daniel.vetter@ffwll.ch
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