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icE1usb fw: Vendor requests to other interface than 0 are not errors

They might be used somewhere else ... just don't handle them, but
let someone else potentially do it.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Ie1bce4565d14d6635d4a32c2a08f64728132a75e
---
M firmware/ice40-riscv/icE1usb/usb_e1.c
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/firmware/ice40-riscv/icE1usb/usb_e1.c b/firmware/ice40-riscv/icE1usb/usb_e1.c
index 34ade71..09b428c 100644
--- a/firmware/ice40-riscv/icE1usb/usb_e1.c
+++ b/firmware/ice40-riscv/icE1usb/usb_e1.c
@@ -375,7 +375,7 @@
 		return _e1_ctrl_req_dev(req, xfer);
 	case USB_REQ_RCPT_INTF:
 		if (req->wIndex != 0)
-			return USB_FND_ERROR;
+			return USB_FND_CONTINUE;
 		return _e1_ctrl_req_intf(req, xfer);
 	case USB_REQ_RCPT_EP:
 	case USB_REQ_RCPT_OTHER:

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