[LARTC] patch: avoid segfault when using PRIO qdisc

[Nikolai Vladychevski <niko@isl.net.mx>]

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Hi,

I am attaching the patch for tc_class.c file in ./tc directory of
iproute2 lastest version. This patch is to avoid segfault when listing
classes. It happends only when using PRIO qdisc. I didn't look why
exactly it segfaults (guess becasue PRIO is classless), but this patch
at least prevents it, so you can run the command and look what is
happening to other classes.

cd to iproute2 directory:

# patch tc/tc_class.c antisegfault-patch-for-tc.diff
# make
# cp tc/tc /usr/bin

tc -s class show dev eth0
now works


Regards

Nikolai

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233c233,235
< 	if ((q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]))) != NULL)
---
> 	if ((q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]))) != NULL) {
> 	    if (!q->print_copt) fprintf(fp, "[can't get Class options, no function defined, sorry the code is buggy!!]");
> 	    else
235c237
< 	else
---
> 	} else