[Bug 192528] pwd_mkdb fails if /etc/shells contains duplicates

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192528

--- Comment #3 from tmwalaszek at gmail.com ---
Hi,
Problem is in function _local_initshells in file lib/libc/gen/getusershell.c

Function is reading /etc/shells and put every shell path to line[MAXPATHLEN +
1]
It looks like this '/bin/csh\0/usr/local/bin/zsh\0/usr/local/bin/bash', it does
not clean this array (and not set pointer at the beggining) on every iteration
so if we have many lines in /etc/shells it will overflow.

Simple patch is in the attachment. Works for me ;)

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