Makefile update

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/Makefile b/Makefile
index b7a25f5..cd061ad 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@
 all: depend $(PROGS) $(SCRIPTS)
 
 clean:
-	-rm -f *.o .depend cscope.out $(PROGS) engines/*.o crc/*.o core.* core
+	-rm -f .depend cscope.out $(OBJS) $(PROGS) core.* core
 
 cscope:
 	@cscope -b