fbdev: omapfb: fix some error codes
[ Upstream commit dc608db7 ] Return negative -ENXIO instead of positive ENXIO. Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
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