test_firmware: replace syfs fallback check with kconfig_has helper
Now that we have a kconfig checker just use that instead of relying on testing a sysfs directory being present, since our requirements are spelled out. Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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