[Bug 262671] Kernel panics after a invalid SNDCTL_MIXERINFO ioctl

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262671

            Bug ID: 262671
           Summary: Kernel panics after a invalid SNDCTL_MIXERINFO ioctl
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: alex@alexslomka.xyz

Created attachment 232581
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232581&action=edit
A patch that should fix brought up issue.

If you call the `SNDCTL_MIXERINFO` ioctl with a `oss_mixerinfo` structure which
has a uninitialized `dev` field, a kernel panic is triggered.

I know that in this case the `dev` field is expected to be set, but I still
think that the kernel should not panic if a malicious/bad program forgets to
set it.

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