Staging: ced1401: fix missing unlock on error in FreeCircBlock()

Add the missing unlock on the error handle path in function
FreeCircBlock().
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ced1401/ced_ioc.c

@@ -1508,7 +1508,7 @@ int FreeCircBlock(DEVICE_EXTENSION * pdx, TCIRCBLOCK __user * pCB)
 		iReturn = U14ERR_BADAREA;
 
 	if (copy_to_user(pCB, &cb, sizeof(cb)))
-		return -EFAULT;
+		iReturn = -EFAULT;
 
 	mutex_unlock(&pdx->io_mutex);
 	return iReturn;