revive_block: If we have an I/O error, don't forget to drop the stripe lock.
revive_block: If we have an I/O error, don't forget to drop the stripe lock.

Approved by:	re (jhb)

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