remove redundant judgments *running_task != NULL

[hujun260]

Summary

remove redundant judgments *running_task != NULL
reason:
In irq, g_running_tasks is always valid.

Impact

arch

Testing

ci ostest

[nuttxpr]

[Experimental Bot, please feedback here]

No, this PR does not fully meet the NuttX requirements. While it provides a summary and identifies the impacted area, it lacks crucial information.

Here's what's missing:

• Insufficient Summary: The summary needs to explain why the judgments are redundant. Simply stating they are redundant isn't enough. What guarantees g_running_task is always valid in an IRQ? Provide a code reference or architectural explanation. What function/file contains this change?
• Incomplete Impact: While it mentions "arch," it needs to specify which architectures are affected. Furthermore, it needs to address all the impact points (user, build, hardware, documentation, security, compatibility). Even if the answer is "NO," it should explicitly state that.
• Missing Testing Details: "ci ostest" is not sufficient. What specific tests were run? Provide details about the build host and target environment (OS, architecture, board, configuration). Crucially, the "Testing logs before change" and "Testing logs after change" sections are empty. These should demonstrate the problem before the change and the successful resolution after the change.

In short, the PR needs significantly more detail to meet the NuttX requirements. It needs to provide a clear and compelling justification for the change, thoroughly analyze its impact, and offer concrete evidence that the change works as intended.

[xiaoxiang781216]

let's ignore the ci error since it's fixed by #15047:

In file included from bluetooth/bt_conn.c:51:
bluetooth/bt_conn.c: In function 'bt_conn_addref':
Error: bluetooth/bt_conn.c:765:10: error: format '%u' expects argument of type 'unsigned int', but argument 4 has type 'bt_atomic_t' {aka 'long int'} [-Werror=format=]
  765 |   wlinfo("handle %u ref %u\n", conn->handle, bt_atomic_get(&conn->ref));
      |          ^~~~~~~~~~~~~~~~~~~~
bluetooth/bt_conn.c:765:26: note: format string is defined here
  765 |   wlinfo("handle %u ref %u\n", conn->handle, bt_atomic_get(&conn->ref));
      |                         ~^
      |                          |
      |                          unsigned int
      |                         %lu
bluetooth/bt_conn.c: In function 'bt_conn_release':
Error: bluetooth/bt_conn.c:790:10: error: format '%u' expects argument of type 'unsigned int', but argument 4 has type 'bt_atomic_t' {aka 'long int'} [-Werror=format=]
  790 |   wlinfo("handle %u ref %u\n", conn->handle, bt_atomic_get(&conn->ref));
      |          ^~~~~~~~~~~~~~~~~~~~
bluetooth/bt_conn.c:790:26: note: format string is defined here
  790 |   wlinfo("handle %u ref %u\n", conn->handle, bt_atomic_get(&conn->ref));
      |                         ~^
      |                          |
      |                          unsigned int
      |                         %lu