[PATCH] selftests: fix compile error for sync

[Lei Yang]

I got below error message when building sync test:

make[1]: Entering directory `tools/testing/selftests/sync'
gcc -c sync.c -o tools/testing/selftests/sync/sync.o
sync.c:42:29: fatal error: linux/sync_file.h: No such file or directory
 #include <linux/sync_file.h>

obviously, CFLAGS and LDFLAGS are not used when comipling.

Signed-off-by: Lei Yang <Lei.Yang@xxxxxxxxxxxxx>
---
 tools/testing/selftests/sync/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/sync/Makefile b/tools/testing/selftests/sync/Makefile
index 8e04d0a..46cbcc3 100644
--- a/tools/testing/selftests/sync/Makefile
+++ b/tools/testing/selftests/sync/Makefile
@@ -29,9 +29,9 @@ $(TEST_CUSTOM_PROGS): $(TESTS) $(OBJS)
 	$(CC) -o $(TEST_CUSTOM_PROGS) $(OBJS) $(TESTS) $(CFLAGS) $(LDFLAGS)
 
 $(OBJS): $(OUTPUT)/%.o: %.c
-	$(CC) -c $^ -o $@
+	$(CC) -c $^ -o $@ $(CFLAGS) $(LDFLAGS)
 
 $(TESTS): $(OUTPUT)/%.o: %.c
-	$(CC) -c $^ -o $@
+	$(CC) -c $^ -o $@ $(CFLAGS) $(LDFLAGS)
 
 EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(OBJS) $(TESTS)
-- 
1.9.1