Merge patch series "binman: properly error out if path provided to key-name-hint...

Merge patch series "binman: properly error out if path provided to key-name-hint in signature nodes"

Quentin Schulz <foss+uboot@0leil.net> says:

I misunderstood the documentation and put the signing key in a keys/
directory while setting key-name-hint property in the signature node and
u-boot-spl-pubkey-dtb to a path.

mkimage doesn't fail if it cannot find the public key when signing a
FIT but returns something on stderr to notify the user it couldn't find
the key. The issue is that bintool currently discards stderr if the
command successfully returns, so the FIT is not signed AND the user
isn't made aware of it unless the image is manually inspected.

mkimage does fail when trying to insert a public key in a DTB if it
isn't found but we can have a better error message.

Link: https://lore.kernel.org/r/20250418-binman-pubkey-dir-v2-0-b6b90a765ffe@cherry.de