Remove duplicate dev.xbd.*.max_requests sysctl added in r252260.
Remove duplicate dev.xbd.*.max_requests sysctl added in r252260.

Approved by:	gibbs

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