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svn:author
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git2svn
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svn:date
V 27
2022-07-29T17:09:55.193804Z
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svn:log
V 700
Fix unused variable warning in fwohci.c

With clang 15, the following -Werror warning is produced:

    sys/dev/firewire/fwohci.c:2762:23: error: variable 'pcnt' set but not used [-Werror,-Wunused-but-set-variable]
            int len, plen, hlen, pcnt, offset;
                                 ^

The 'pcnt' variable is eventually used only in an #if 0'd block,
obviously meant for debugging. Ensure that 'pcnt' is only declared and
used when COUNT_PACKETS is defined, so the debugging can be easily
turned on later, if desired.

MFC after:	3 days

(cherry picked from commit d7e0d962f39877b997454992a980f4122c6316e7)

Git Hash:   94b81ba2a0f97019bd85fed273d69076396f1d11
Git Author: dim@FreeBSD.org
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