Patch for memory leak in vfs_defaults.c

[Andrew Walker]

Hi all,
I encountered an issue where several FreeNAS users on samba 4.7 were
experiencing memory leak resulting in single smbd process consuming all
available RAM and swap space. Disabling the getwd cache significantly
increased rate of leak, and enabling widelinks / disabling unix extensions
made the leak apparently stop. Investigation indicated that the leak was in
vfswrap_getwd().

The attached patch resolved the issue.

Thank you,
Andrew
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