Fix compilation on SunCC for -current

[Alex Kiernan]

SunCC is finicky about having statements after labels:

Index: art.c
===================================================================
RCS file: /upstream-repositories/inn-cvs.isc.org/inn/innd/art.c,v
retrieving revision 1.157
diff -u -r1.157 art.c
--- art.c	2001/02/03 18:32:37	1.157
+++ art.c	2001/02/05 12:34:13
@@ -849,6 +849,7 @@
 	i++;
       }
 endofheaderline:
+      ;
     }
   } else {
 bodyprocessing:
@@ -917,6 +918,7 @@
 	i++;
       }
 endofline:
+      ;
     }
   }
 sizecheck: