video: hgafb: fix potential NULL pointer dereference
[ Upstream commit ec7f6aad ] When ioremap fails, hga_vram should not be dereferenced. The fix check the failure to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu <kjlu@umn.edu> Cc: Aditya Pakki <pakki001@umn.edu> Cc: Ferenc Bakonyi <fero@drama.obuda.kando.hu> [b.zolnierkie: minor patch summary fixup] Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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