Birdtest: small change

for dir in client conf filter lib misc nest proto sysdep; do

	for i in $(find "$srcdir/$dir" -name '*_test.c'); do num_all_tests_src=$((num_all_tests_src + 1)); done

done

num_build_fail_tests=$((num_all_tests_src - num_all_tests))

if [ $num_build_fail_tests -lt 0 ]; then

	num_build_fail_tests=0

fi

echo ""

echo "  ------------------------------"