selftests: fix clean target in kcmp Makefile

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Cc: Dave Young <dyoung@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/tools/testing/selftests/kcmp/Makefile b/tools/testing/selftests/kcmp/Makefile
index 56eb552..d7d6bbe 100644
--- a/tools/testing/selftests/kcmp/Makefile
+++ b/tools/testing/selftests/kcmp/Makefile
@@ -25,5 +25,4 @@
 	@./kcmp_test || echo "kcmp_test: [FAIL]"
 
 clean:
-	rm -fr ./run_test
-	rm -fr ./test-file
+	$(RM) kcmp_test kcmp-test-file