workqueue: fix a typo

s/detemined/determined

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/workqueue.c

@@ -2618,7 +2618,7 @@ EXPORT_SYMBOL_GPL(flush_workqueue);
  * Wait until the workqueue becomes empty.  While draining is in progress,
  * only chain queueing is allowed.  IOW, only currently pending or running
  * work items on @wq can queue further work items on it.  @wq is flushed
- * repeatedly until it becomes empty.  The number of flushing is detemined
+ * repeatedly until it becomes empty.  The number of flushing is determined
  * by the depth of chaining and should be relatively short.  Whine if it
  * takes too long.
  */