Fix a file descriptor leak in cam_open_btl().  The xpt device was opened, but never closed.
Fix a file descriptor leak in cam_open_btl().  The xpt device was opened,
but never closed.

Submitted by:	amobbs@allstor-sw.co.uk

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