efi_loader: ARM: don't attempt to enter non-secure mode twice
Multiple EFI binaries may be executed in sequence. So if we already are in non-secure mode after running the first one we should skip the switching code since it no longer works once we're non-secure. Signed-off-by: NMark Kettenis <kettenis@openbsd.org> Signed-off-by: NAlexander Graf <agraf@suse.de>
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