klp-build: Fix hang on out-of-date .config

If .config is out of date with the kernel source, 'make syncconfig'
hangs while waiting for user input on new config options.  Detect the
mismatch and return an error.

Fixes: 6f93f7b068 ("livepatch/klp-build: Fix inconsistent kernel version")
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf 2026-04-02 19:47:10 -07:00
commit cc39ccce7d