[PATCH v2] selftests: splice: override clean in lib.mk to fix warnings

[Shuah Khan]

Add override with EXTRA_CLEAN 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 <shuahkh at osg.samsung.com>
---
Changes since v1:
- simplified to use EXTRA_CLEAN based on Michael Ellerman's comments.

 tools/testing/selftests/splice/Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/testing/selftests/splice/Makefile b/tools/testing/selftests/splice/Makefile
index 559512c..9fc78e5 100644
--- a/tools/testing/selftests/splice/Makefile
+++ b/tools/testing/selftests/splice/Makefile
@@ -4,5 +4,4 @@ all: $(TEST_PROGS) $(EXTRA)
 
 include ../lib.mk
 
-clean:
-	rm -fr $(EXTRA)
+EXTRA_CLEAN := $(EXTRA)
-- 
2.9.3