Avoid hang in stdio_set_chars_available_callback #2020
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The function is setting the callback after enabing the interrupt which can cause a hang if a receive character is already pending. Similarly we also have to clear the callback pointer only after the interrupt is disabled. Fixes raspberrypi#2009
peterharperuk
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The function is setting the callback after enabing interrupts which can cause a hang if a receive character is already pending. Smilarly we also have to clear the callback pointer only after the interrupt is disabled.
Fixes #2009