core dump when accessing bad pages in texinfo-4.13

[Eric Blake]

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This email came up on the cygwin lists, but seems like an upstream problem:

>> This version doesn't like pages that don't exist:
>>
>> $ info --version | head -n1
>> info (GNU texinfo) 4.13
>> $ info nonesuch
>> Segmentation fault (core dumped)
> 
> Since I had just build texinfo for debugging Marco's makeinfo problem, I
> was curious.  Info calls strlen(manpage_section) without noticing that
> manpage_section == NULL in man.c, line 342.
> 

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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