drivers: udc_rpi_pico: fix OUT transfer handling in ISR

Do not check if the tailroom is greater than or equal to MPS because the
controller does not write directly to the buffer and therefore cannot
write outside the buffer.

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

drivers/usb/udc/udc_rpi_pico.c

@@ -628,8 +628,7 @@ static void rpi_pico_handle_buff_status_out(const struct device *dev, const uint
 	len = read_buf_ctrl_reg(dev, ep) & USB_BUF_CTRL_LEN_MASK;
 	net_buf_add_mem(buf, ep_data->buf, MIN(len, net_buf_tailroom(buf)));
 
-	if (net_buf_tailroom(buf) >= udc_mps_ep_size(ep_cfg) &&
-	    len == udc_mps_ep_size(ep_cfg)) {
+	if (net_buf_tailroom(buf) && len == udc_mps_ep_size(ep_cfg)) {
 		__unused int err;
 
 		err = rpi_pico_prep_rx(dev, buf, ep_cfg);