[linux-cifs-client] patch to fix an error during set security descriptor

[Shirish Pargaonkar]

As per current implementation of chmod, cifs client send a security descriptor
consisting of three aces in a dacl, owner, group, and other.
There is bug i.e. the allocated size to build security descriptor
utilizes the size
obtained during get security descriptor.  This size can be smaller as the
file may have less than three aces in which case the allocated size of
security descriptor to set is inadequate.
This fix allocates a minimum size needed to build the largest possible
security descriptor containing three aces.
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