efi_selftest: support printing leading zeroes
Allow specifying the precision when printing integers, e.g. efi_st_printf("%.4u-%.2u-%.2u\n", year, month, day); Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: NAlexander Graf <agraf@suse.de>
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