storage: Correct when we check for USB mounts

[jepler]

Closes #4417

I only compile-tested this for feather rp2040 with

diff --git a/ports/raspberrypi/boards/adafruit_feather_rp2040/mpconfigboard.mk b/ports/raspberrypi/boards/adafruit_feather_rp2040/mpconfigboard.mk
index f4106b94a..f891c3668 100644
--- a/ports/raspberrypi/boards/adafruit_feather_rp2040/mpconfigboard.mk
+++ b/ports/raspberrypi/boards/adafruit_feather_rp2040/mpconfigboard.mk
@@ -7,3 +7,5 @@ CHIP_VARIANT = RP2040
 CHIP_FAMILY = rp2
 
 INTERNAL_FLASH_FILESYSTEM = 1
+
+CIRCUITPY_USB_MSC = 0

@ArielWolle @miclooking please test with this change and let us know if it resolves the problem for you.

[dhalbert]

I think that we should also guard the usb_msc... declarationsinsupervisor/usb.hwith#if CIRCUITPY_USB_MSC`.

[miclooking]

please test with this change and let us know if it resolves the problem for you

This change resolves the problem for me.
Thanks.

[jepler]

I think that we should also guard the usb_msc... declarationsinsupervisor/usb.hwith#if CIRCUITPY_USB_MSC`.

Good idea, done. Please re-review @dhalbert

[dhalbert]

Thanks! Tested that building Trinket M0 and Feather RP2040 don't fail when CIRCUITPY_USB_MSC = 0 is added to mpconfigboardk.mk.