[bug-cflow] -I causes segmentation fault

[Sean Anderson]

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Hi,

        The -I option causes a segmentation fault no matter what directory is 
passed
to it (even empty directories). The minimal reproducible test case is

$ touch test.c
$ mkdir testdir
$ cflow test.c -Itestdir
Segmentation fault (core dumped)
$ cflow --version
cflow (GNU cflow) 1.5
Copyright (C) 2005, 2006, 2009, 2010, 2011, 2014 2014 Sergey Poznyakoff
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Sergey Poznyakoff.

This occurs with Linux 4.20.0 and glibc 2.28-5. cflow was compiled with gcc
8.2.1. I am not subscribed to bug-cflow, so please CC me on all responses.

        --Sean
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