Fix a file descriptor leak in cam_lookup_pass() when the ioctl to find the passthru device fails.
Fix a file descriptor leak in cam_lookup_pass() when the ioctl to find
the passthru device fails.

Approved by:	scottl
MFC after:	1 day

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