USB: devio.c add missing INIT_LIST_HEAD()

It should hopefully fix the list corruption bug on:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214402

Add a missing INIT_LIST_HEAD()

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/devio.c

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 74be846..2087766 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -570,6 +570,7 @@
 	ps->dev = dev;
 	ps->file = file;
 	spin_lock_init(&ps->lock);
+	INIT_LIST_HEAD(&ps->list);
 	INIT_LIST_HEAD(&ps->async_pending);
 	INIT_LIST_HEAD(&ps->async_completed);
 	init_waitqueue_head(&ps->wait);