checks: kconfig: Improve message for undefined references

Got stuff like

    Found references to undefined Kconfig symbols. If any of these are
    false positives, then add them to UNDEF_KCONFIG_WHITELIST in
    /var/lib/shippable/.../gitRepo/scripts/check_compliance.py in the
    ci-tools repo.

    ...

Now it's just

    Found references to undefined Kconfig symbols. If any of these are
    false positives, then add them to UNDEF_KCONFIG_WHITELIST in
    check_compliance.py in the ci-tools repo.

    ...

Signed-off-by: Ulf Magnusson <[email protected]>

Author: ulfalizer

scripts/ci/check_compliance.py

@@ -359,8 +359,8 @@ def check_no_undef_outside_kconfig(self, kconf):
 
         self.add_failure("""
 Found references to undefined Kconfig symbols. If any of these are false
-positives, then add them to UNDEF_KCONFIG_WHITELIST in {} in the ci-tools
-repo.\n\n{}""".format(__file__, undef_desc))
+positives, then add them to UNDEF_KCONFIG_WHITELIST in {} in the
+ci-tools repo.\n\n{}""".format(os.path.basename(__file__), undef_desc))
 
 
 # Many of these are either symbols used as examples or due to token pasting