selftests: lib: return Kselftest Skip code for skipped tests

When lib test(s) is skipped because of unmet dependencies and/or
unsupported configuration, it returns non-zero value hich 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: Shuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/lib/printf.sh

@@ -1,9 +1,13 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # Runs printf infrastructure using test_printf kernel module
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 if ! /sbin/modprobe -q -n test_printf; then
-	echo "printf: [SKIP]"
-	exit 77
+	echo "printf: module test_printf is not found [SKIP]"
+	exit $ksft_skip
 fi
 
 if /sbin/modprobe -q test_printf; then