MFC 1.22: in the ufsdirhash_build() failure case for corrupted directories or unreadable blocks, make sure to destroy the mutex we created.
MFC 1.22: in the ufsdirhash_build() failure case for corrupted
directories or unreadable blocks, make sure to destroy the mutex
we created.

Approved by:	re (scottl)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase