[Bug 239672] [patch] gcov: optimize list traverse by using LIST_FOREACH_SAFE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239672

            Bug ID: 239672
           Summary: [patch] gcov: optimize list traverse by using
                    LIST_FOREACH_SAFE
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: gnu
          Assignee: bugs at FreeBSD.org
          Reporter: hslester96 at gmail.com

Created attachment 206304
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=206304&action=edit
gcov_fs patch

The original implementation of gcov_stats_reset() uses LIST_FOREACH to traverse
the list.
However, because of the remove inside, it has to traverse from the beginning
every time after removing node.
We can utilize LIST_FOREACH_SAFE to eliminate such redundant operations.

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