efi_selftest: correct definition of efi_st_error

Enclose definition in parantheses to allow using efi_st_error
like a void function.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
1 file changed