Merge branch 'selftests-drv-net-ncdevmem-fix-error-paths'

Jakub Kicinski says:

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selftests: drv-net: ncdevmem: fix error paths

Make ncdevmem clean up after itself. While at it make sure it sets
HDS threshold to 0 automatically.

v1: https://lore.kernel.org/20250822200052.1675613-1-kuba@kernel.org
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Link: https://patch.msgid.link/20250825180447.2252977-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>