Fix build if both of BKTR_USE_FREEBSD_SMBUS and BKTR_NEW_MSP34XX_DRIVER are defined.
Fix build if both of BKTR_USE_FREEBSD_SMBUS and BKTR_NEW_MSP34XX_DRIVER are
defined.

Thanks to Damian Gerow <dgerow@afflictions.org> for pointing out this problem.
RELENG_5 candidate.

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