Fix segfault when unable to connect to stdio_usb device #155
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This adds
dr_vidpid_stdio_usb_cant_connect
to thepicoboot_device_result
enum, to provide a more useful error when picotool is unable to connect to a device using stdio_usb. The current behaviour was a segfault in this situation, so this now fixes #151This also builds on #154 to add the correct device to the error message when a stdio_usb device is discovered, rather than just printing RP-series.