[Bug 217747] PVS-Studio: NULL Pointer Dereference (CWE-476) (1)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217747

            Bug ID: 217747
           Summary: PVS-Studio: NULL Pointer Dereference (CWE-476) (1)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: razmyslov at viva64.com

Created attachment 180770
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180770&action=edit
git patch

We have found and fixed a vulnerability using PVS-Studio tool. PVS-Studio is a
static code analyzer for C, C++ and C#: https://www.viva64.com/en/pvs-studio/

Analyzer warning: V595 The 'mc' pointer was utilized before it was verified
against nullptr. Check lines: 2954, 2955. mly.c 2954

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