efi_loader: error handling in read_console()

getc() might return an error code. Avoid an incorrect converison to
Unicode.

This addresses CoverityScan CID 184087.

Reported-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
1 file changed