ipmi: msghandler: Make symbol 'remove_work_wq' static

The sparse tool complains as follows:

drivers/char/ipmi/ipmi_msghandler.c:194:25: warning:
 symbol 'remove_work_wq' was not declared. Should it be static?

This symbol is not used outside of ipmi_msghandler.c, so
marks it static.

Fixes: 1d49eb91 ("ipmi: Move remove_work to dedicated workqueue")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Message-Id: <20211123083618.2366808-1-weiyongjun1@huawei.com>
Signed-off-by: NCorey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_msghandler.c

@@ -191,7 +191,7 @@ struct ipmi_user {
 	struct work_struct remove_work;
 };
 
-struct workqueue_struct *remove_work_wq;
+static struct workqueue_struct *remove_work_wq;
 
 static struct ipmi_user *acquire_ipmi_user(struct ipmi_user *user, int *index)
 	__acquires(user->release_barrier)