include/linux/vmpressure.h: use spinlock_t instead of struct spinlock

For spinlocks the type spinlock_t should be used instead of "struct
spinlock".

Use spinlock_t for spinlock's definition.

Link: http://lkml.kernel.org/r/20190704153803.12739-3-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/vmpressure.h

@@ -17,7 +17,7 @@ struct vmpressure {
 	unsigned long tree_scanned;
 	unsigned long tree_reclaimed;
 	/* The lock is used to keep the scanned/reclaimed above in sync. */
-	struct spinlock sr_lock;
+	spinlock_t sr_lock;
 
 	/* The list of vmpressure_event structs. */
 	struct list_head events;