Only patch maybe invalid in this case and here are now many

kernel with extra version string (e.g. -ac).

ipppd/sys-linux.c

@@ -1258,8 +1258,6 @@ static void decode_version (char *buf, int *version,
     
     if (*buf != '\0' && strncmp(buf, "-pre", 4) && strncmp(buf, "pre", 3))  /* ignore any "-preX" part */
       {
-	*version      =
-	*modification =
 	*patch        = 0;
       }
   }