lint: properly terminate junit report on error

Otherwise </testsuite> is missing and jenkins can't make sense of
things.

Change-Id: If11a6d2506efc9d7c915f50896b2714bc66e3b65
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/12478
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

util/lint/lint

@@ -69,6 +69,6 @@ for script in "$(dirname "$0")/${1}-"*; do
 	junit_write '	</testcase>'
 done
 
-test $FAILED -eq 0 || { echo "ERROR: $FAILED test(s) failed."; rm -f "$LINTLOG" && exit 1; };
 rm -f "$LINTLOG"
 junit_write '</testsuite>'
+test $FAILED -eq 0 || { echo "ERROR: $FAILED test(s) failed."; exit 1; };