Fix accessing per-crtc scanouts in OMAPPrepareAccess.

Actually give back the main scanout, as the comment says.
Used to return the per-crtc scanout, leading to crashes.

BUG=chromium:222157
TEST=Swap primary display

Change-Id: I65ab677d98dded6aaecf9069dcd07e2bfdb1da6b
Previous-Reviewed-on: https://gerrit.chromium.org/gerrit/46599
(cherry picked from commit 2e66a7c222ea876586079e4c3fabd3e271d115ee)
Reviewed-on: https://gerrit.chromium.org/gerrit/46645
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Tested-by: Mitsuru Oshima <oshima@chromium.org>
1 file changed