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sys/usb_cdc_acm_stdio: only submit and flush for non-empty buffer [backport 2024.10] #18567

sys/usb_cdc_acm_stdio: only submit and flush for non-empty buffer [backport 2024.10]

sys/usb_cdc_acm_stdio: only submit and flush for non-empty buffer [backport 2024.10] #18567