(isc_getipnum): Fixed error introduced in last commit.

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

@@ -179,7 +179,7 @@ char *isc_getipnum(IscAddress *ia, char *buf, int len)
   addr = (struct sockaddr_in *) &ia->ip.saddr;
   
   strncpy(buf, inet_ntoa(addr->sin_addr), len-1);
-  buf[len] = '\0';
+  buf[len-1] = '\0';
 
   return buf;
 }