Build warnings -- [-Wuninitialized]

[henrygab]

See example logs at https://github.com/adafruit/ArduinoCore-samd/runs/965558867

Simplified log

.../USBHost/src/parsetools.h:
    In member function 'virtual void UniversalReportParser::Parse(HID*, uint32_t, uint32_t, uint8_t*)':

.../USBHost/src/parsetools.h:47:33:
    warning: '*((void*)(& prs)+4).MultiValueBuffer::valueSize' is used uninitialized in this function [-Wuninitialized]
   47 |   countDown = valueSize = pbuf->valueSize;
      |                           ~~~~~~^~~~~~~~~

-Wuninitialized information

GCC says the code will use uninitialized variables in at least some cases. That's bad, because it's much stronger than -Wmaybe-uninitialized.

Interpretation

Code will read from the specified location, and GCC believe it is will be uninitialized memory read from.

Recommendation

tbd