*: rename ATTRIBUTE_XXX to just XXX.

diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index bae695b..1f6ec2d 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -65,7 +65,7 @@
 }
 
 int switch_root_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int switch_root_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int switch_root_main(int argc UNUSED_PARAM, char **argv)
 {
 	char *newroot, *console = NULL;
 	struct stat st1, st2;