[DM/PCI] Fixup the C99, 6.8.1 Labeled statements p4

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拉取/合并请求描述：(PR description)

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Fixup the C99, 6.8.1 Labeled statements p4

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我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
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为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

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🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page
   点击进入工作流 → | Click to open workflow →

2. 点击 Run workflow | Click Run workflow

• 设置需排除的文件/目录（目录请以"/"结尾）
  Set files/directories to exclude (directories should end with "/")
• 将目标分支设置为 \ Set the target branch to：pci
• 设置PR number为 \ Set the PR number to：10991

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完成后，提交将自动更新至 pci 分支，关联的 Pull Request 也会同步更新。
Once completed, commits will be pushed to the pci branch automatically, and the related Pull Request will be updated.

如有问题欢迎联系我们，再次感谢您的贡献！💐
If you have any questions, feel free to reach out. Thanks again for your contribution!

[github-actions]

📌 Code Review Assignment

🏷️ Tag: components

Reviewers: @Maihuanyi

Changed Files (Click to expand)

• components/drivers/pci/endpoint/mem.c

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📊 Current Review Status (Last Updated: 2025-12-01 16:34 CST)

• ⌛ @Maihuanyi Pending Review

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   Comment LGTM/lgtm after confirming approval

3. PR合并前需至少一位维护者确认
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ℹ️ Refresh CI status operation requires repository Write permission.

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@Maihuanyi

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Pull request overview

This PR fixes a C99 standard compliance issue in the PCI endpoint memory management code by adding a null statement after a labeled statement.

Key Changes:

• Added null statement (;) after the _next: label to comply with C99 standard section 6.8.1 paragraph 4, which requires labels to be followed by a statement

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@Rbb666