[bug #28422] [util/misc.c] realpath(path, NULL) leads to segfault

[Robert Millan]

Follow-up Comment #4, bug #28422 (project grub):

Hi Grégoire,

Sorry to bother you, but after discussing this with Vladimir and thinking a
bit more about it, I think we can live with an ifdef in our code if it's
confined to util/misc.c and reasonably platform-independant.

Please let me know if attached patch works.  Then for NetBSD support you'd
only have to replace the remaining realpath() calls in other parts of the
code.

Thanks

(file #19379)
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