efi_loader: NULL dereference in EFI console
Even if CONFIG_DM_VIDEO=y and stdout="vidconsole", a video device may not
be available. Check the return values of the relevant functions.
If no video output device is available, assume that the serial console is
in use.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
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