iolog_read_timing_record: only log the first 128 bytes of bad lines

If the timing line is invalid or corrupt there's no reason to log
the entire thing, up to LINE_MAX.  The first 128 bytes should
be sufficient to debug the problem.

Author: millert

lib/iolog/iolog_timing.c

@@ -281,6 +281,8 @@ iolog_read_timing_record(struct iolog_file *iol, struct timing_closure *timing)
 
     debug_return_int(0);
 invalid:
+    /* Truncate invalid timing file line at 128 bytes. */
+    line[128] = '\0';
     sudo_warnx(U_("invalid timing file line: %s"), line);
     debug_return_int(-1);
 }