Warning fix

[kevin kane]

Fix warning:
   checknr.c:558:8: warning: extra tokens at end of #endif directive

Index: checknr.c
===================================================================
RCS file: /home/dcvs/src/usr.bin/checknr/checknr.c,v
retrieving revision 1.11
diff -u -r1.11 checknr.c
--- checknr.c   4 Mar 2005 02:53:55 -0000       1.11
+++ checknr.c   19 Jan 2006 02:51:30 -0000
@@ -555,7 +555,7 @@
        if (binsrch(mac, &slot) >= 0) {
 #ifdef DEBUG
                printf("binsrch(%s) -> already in table\n", mac);
-#endif DEBUG
+#endif /* DEBUG */
                return;
        }
 #ifdef DEBUG