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

index 3388102..c5a0d27 100644
@@ -122,10 +122,10 @@ int init_module(void)
 
 	pdev = do_pci_probe();
 	if (pdev == NULL)
-		return 1;
+		return -ENODEV;
 
 	if (!atir_init_start())
-		return 1;
+		return -ENODEV;
 
 	strcpy(atir_driver.name, "ATIR");
 	atir_driver.minor       = -1;