Add override for lib.mk clean to fix the following warnings from clean
target run.

Makefile:8: warning: overriding recipe for target 'clean'
../lib.mk:55: warning: ignoring old recipe for target 'clean'

Signed-off-by: Shuah Khan <redacted>
---
 tools/testing/selftests/splice/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/splice/Makefile b/tools/testing/selftests/splice/Makefile
index 559512c..3f967ba 100644
--- a/tools/testing/selftests/splice/Makefile
+++ b/tools/testing/selftests/splice/Makefile

@@ -4,5 +4,6 @@ all: $(TEST_PROGS) $(EXTRA)
 
 include ../lib.mk
 
-clean:
+override define CLEAN
 	rm -fr $(EXTRA)
+endef

-- 
2.9.3