raiden00pl opened a new pull request, #20643:
URL: https://github.com/apache/nuttx/pull/20643

   
   ## Summary
   
   FIONREAD wrote the count through a uint8_t pointer, but
   include/nuttx/fs/ioctl.h defines its argument as int *.  The count
   was also negative once the RX FIFO had wrapped.
   
   Write an int and handle the wrap.  Callers that passed a uint8_t
   must pass an int now.  The result is still the number of queued
   messages, not bytes.
   
   ## Impact
   bugfix
   
   ## Testing
   detected by automate tests from https://github.com/railab/nuttx-testlab
   


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