[PR] nshlib/cmd_cat: Avoid casting -1 to size_t as count of nsh_write() [nuttx-apps]

[via GitHub]

JianyuWang0623 opened a new pull request, #2741:
URL: https://github.com/apache/nuttx-apps/pull/2741

   ## Summary
   e.g. Casting "-1" to `size_t` is equals to a very large value.
   
   ## Impact
   cmd_cat
   
   ## Testing
   CI
   
   


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