selftests: cpufreq: return Kselftest Skip code for skipped tests

When cpufreq test is skipped because of unmet dependencies and/or
unsupported configuration, it exits with error which is treated as
a fail by the Kselftest framework. This leads to false negative
result even when the test could not be run.

Change it to return kselftest skip code when a test gets skipped to
clearly report that the test could not be run.

Kselftest framework SKIP code is 4 and the framework prints appropriate
messages to indicate that the test is skipped.
Signed-off-by: NShuah Khan (Samsung OSG) <shuah@kernel.org>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NShuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/cpufreq/main.sh

@@ -13,6 +13,9 @@ SYSFS=
 CPUROOT=
 CPUFREQROOT=
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 helpme()
 {
 	printf "Usage: $0 [-h] [-todg args]
@@ -38,7 +41,7 @@ prerequisite()
 
 	if [ $UID != 0 ]; then
 		echo $msg must be run as root >&2
-		exit 2
+		exit $ksft_skip
 	fi
 
 	taskset -p 01 $$