Description

When picolibc is used instead of newlib, the output of stdio_tinyusb_cdc_acm hangs. This does not happen with stdio_cdc_acm (usbus).

Steps to reproduce the issue

Combine

USEMODULE += stdio_tinyusb_cdc_acm

with

FEATURES_REQUIRED += picolibc

Expected results

You can connect to the /dev/ttyACMx interface and receive stdio in/output.

Actual results

The terminal hangs when connecting to /dev/ttyACMx, even disconnect is only possible after a timeout.

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