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Fix a stack overflow in mount_smbfs when hostname is too long.
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Authored by brooks on Jun 20 2018, 8:25 PM.
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Summary

The local hostname was blindly copied into the to the nn_name array.
When the hostname exceeded 16 bytes, it would overflow.

PR: 228354
Reported by: donald.buchholz@intel.com

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Buildable 17498
Build 17325: arc lint + arc unit