[PR] ptmx: When alloc minor, skip the start addr if it has been used [nuttx]

[via GitHub]

yangsong8-a1 opened a new pull request, #15924:
URL: https://github.com/apache/nuttx/pull/15924

   *Note: Please adhere to [Contributing 
Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md).*
   
   ## Summary
   
   The alloctab can be looped, if the first check the corresponding bit is set, 
it will not continue to loop
   
   ## Impact
   
   ptmx
   
   ## Testing
   
   selftest
   
   
   


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