ipmi:watchdog: Set panic count to proper value on a panic

ipmi:watchdog: Set panic count to proper value on a panic

commit 882d31ad023a9e5d18163bd624a2b8615db1aa16 upstream.

You will get two decrements when the messages on a panic are sent, not
one, since commit d4852151ce35 ("ipmi: Free receive messages when in an
oops") was added, but the watchdog code had a bug where it didn't set
the value properly.

Reported-by: Anton Lundin <glance@acc.umu.se>
Cc: <Stable@vger.kernel.org> # v5.4+
Fixes: d4852151ce35 ("ipmi: Free receive messages when in an oops")
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>