AuthorizedKeysFile in Match block causes seg. fault

[Rein Tollevik]

OpenSSH 5.6p1 will attempt to free static storage and seg. fault if
AuthorizedKeysFile is used within a Match block without any global
specification of that option.  A simple fix is to xstrdup the defined
pathnames as in the attached patch.

--
Rein Tollevik
Basefarm AS
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