style: Fix coding style violations in nuttx-apps

[no1wudi]

Summary

Fix coding style violations in nuttx-apps to comply with checkpatch.sh requirements. This change addresses various style issues identified by the automated style checker, including case statement formatting, include placement, whitespace issues, long line formatting, and bracket alignment across multiple application modules.

Impact

• Impact on user: NO - Pure style change, no functional changes
• Impact on build: NO - No build system changes
• Impact on hardware: NO - No hardware-related changes
• Impact on documentation: NO - No documentation changes
• Impact on security: NO - No security impact
• Impact on compatibility: NO - No API or behavior changes

Testing

Verified all staged changes pass checkpatch.sh:

git diff --cached | tools/checkpatch.sh -
✔️ All checks pass.

[xiaoxiang781216]

@no1wudi please fix:

Used config files:
    1: .codespellrc
/home/runner/work/nuttx-apps/nuttx-apps/apps/examples/elf/tests/pthread/pthread.c:125: exitted ==> exited
/home/runner/work/nuttx-apps/nuttx-apps/apps/examples/nxflat/tests/pthread/pthread.c:122: exitted ==> exited
/home/runner/work/nuttx-apps/nuttx-apps/apps/system/telnet/telnet_chatd.c:43: licesne ==> license
/home/runner/work/nuttx-apps/nuttx-apps/apps/system/telnet/telnet_client.c:43: licesne ==> license
Some checks failed. For contributing guidelines, see:
  https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md
Error: Process completed with exit code 1.

[cederom]

Thank you @no1wudi :-)