'klist_test_struct' has been unused since the original
commit 57b4f760f94d ("list: test: Test the klist structure").
Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org> Reviewed-by: David Gow <davidgow@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>