(isc_getipnum): Use the entire hostname buffer.

src/libraries/libisc-new/src/isc_socket.c

@@ -173,12 +173,12 @@ char *isc_getipnum(IscAddress *ia, char *buf, int len)
   if (!buf)
   {
     buf = hostname;
-    len = sizeof(hostname)-1;
+    len = sizeof(hostname);
   }
   
   addr = (struct sockaddr_in *) &ia->ip.saddr;
   
-  strncpy(buf, inet_ntoa(addr->sin_addr), len);
+  strncpy(buf, inet_ntoa(addr->sin_addr), len-1);
   buf[len] = '\0';
 
   return buf;