vsprintf.c: correct printing of a NULL device path
When printing '%pD' with a value of NULL we want to output '<NULL>'. But this requires copying to buf. Leave this to string16. A unit test is supplied which relies on EFI support in the sandbox. The development for EFI support in the sandbox is currently in branch u-boot-dm/efi-working. The branch lacks commit 6ea8b580 ("efi_loader: correct DeviceNodeToText for media types"). Ater rebasing the aforementioned branch on U-Boot v2018.01 and adding 256060e4 and this patch the test is executed successfully. Fixes: 256060e4 (vsprintf.c: add EFI device path printing) Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: NAlexander Graf <agraf@suse.de>
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