[PR] fs/vfs: check if all `iov_base` are accessible [nuttx]

[via GitHub]

JianyuWang0623 opened a new pull request, #16490:
URL: https://github.com/apache/nuttx/pull/16490

   ## Summary
   Check if all `iov_base` are inside accessible address space.
   e.g.
   ```
     ret = write(fd, NULL, 3);
   ```
   The `iov.iov_base` is NULL but `iov.iov_len` is NOT zero.
   
https://github.com/apache/nuttx/blob/dd07367f4eeb5ebe785c601e84143cfaf6ad411a/fs/vfs/fs_write.c#L425-L432
   
   And, if `iov.iov_base` is not NULL but `iov.iov_len` is zero, skipped (same 
as Linux).
   ## Impact
   fs/vfs
   
   ## Testing
   CI
   
   
   


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