staging/lirc_bt829: Return -ENODEV when no hardware is found.

sys_init_module: 'lirc_bt829'->init suspiciously returned 1, it should follow 0/-E convention
sys_init_module: loading module anyway...
Pid: 8511, comm: modprobe Tainted: G        WC  3.0.0-rc6+ #73
Call Trace:
 [<ffffffff810b3da7>] sys_init_module+0x217/0x230
 [<ffffffff815ed1d2>] system_call_fastpath+0x16/0x1b

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>