regularize format of source file headers, no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/volume_id/unused_mac.c b/util-linux/volume_id/unused_mac.c
index 997d330..a0d253e 100644
--- a/util-linux/volume_id/unused_mac.c
+++ b/util-linux/volume_id/unused_mac.c
@@ -17,14 +17,13 @@
  *	License along with this library; if not, write to the Free Software
  *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
-
-//kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_MAC) += mac.o
-
 //config:### config FEATURE_VOLUMEID_MAC
 //config:###	bool "mac filesystem"
 //config:###	default y
 //config:###	depends on VOLUMEID
 
+//kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_MAC) += mac.o
+
 #include "volume_id_internal.h"
 
 struct mac_driver_desc {