Squashed commit of the following:

configs/z80sim and xtrs:  Serial driver lower halfs ioctl methods should return a negated errno value, not set the errno variable.

    drivers/wireless:  CC1101 driver not permitted to set errno.

    drivers/sensors:  LIS331DL driver not permitted to set errno.

    drivers/lcd: ILI9341 initialize method not permitted to set errno,

    drivers/serial: 16550 UART driver IOCTL method must not set errno; it must return a negated errno value.

configs/z80sim/src/z80_serial.c

@@ -215,8 +215,7 @@ static void up_detach(FAR struct uart_dev_s *dev)
 
 static int up_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 {
-  *get_errno_ptr() = ENOTTY;
-  return ERROR;
+  return -ENOTTY;
 }
 
 /****************************************************************************