selftests: kselftest: Remove outdated comment

Commit 3c07aaef ("selftests: kselftest: change KSFT_SKIP=4 instead of
KSFT_PASS") reverted commit 11867a77 ("selftests: kselftest framework:
change skip exit code to 0") but missed removing the comment which that
commit added, so do that now.
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/kselftest.h

@@ -19,7 +19,6 @@
 #define KSFT_FAIL  1
 #define KSFT_XFAIL 2
 #define KSFT_XPASS 3
-/* Treat skip as pass */
 #define KSFT_SKIP  4
 
 /* counters */