[Bug 238634] [Patch] dev:md:md.c: Fix a kernel address leakage

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238634

            Bug ID: 238634
           Summary: [Patch] dev:md:md.c: Fix a kernel address leakage
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: huangfq.daxian at gmail.com

Created attachment 205154
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=205154&action=edit
The patch file

If the kernel is create with option MD_ROOT,
g_md_init will call md_preload and use mfs_root as the image.
In function md_preload, the address of image will be printed out.
In this case, the address of image is the address of a global
object mfs_root.
A kernel leakage happens.
Fix this by making this printing only happen when md_debug > 0.

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