workqueue: Increase worker desc's length to 32

Commit 31c89007 ("workqueue.c: Increase workqueue name length")
increased WQ_NAME_LEN from 24 to 32, but forget to increase
WORKER_DESC_LEN, which would cause truncation when setting kworker's
desc from workqueue_struct's name, process_one_work() for example.

Fixes: 31c89007 ("workqueue.c: Increase workqueue name length")
Signed-off-by: Wenchao Hao <haowenchao22@gmail.com>
CC: Audra Mitchell <audra@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

include/linux/workqueue.h

@@ -95,7 +95,7 @@ enum wq_misc_consts {
 	WORK_BUSY_RUNNING	= 1 << 1,
 
 	/* maximum string length for set_worker_desc() */
-	WORKER_DESC_LEN		= 24,
+	WORKER_DESC_LEN		= 32,
 };
 
 /* Convenience constants - of type 'unsigned long', not 'enum'! */