[PATCH -next] um: vector: fix missing unlock on error in vector_net_open()

[Wei Yongjun]

Add the missing unlock before return from function vector_net_open()
in the error handling case.

Fixes: ad1f62ab2bd4 ("High Performance UML Vector Network Driver")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 arch/um/drivers/vector_kern.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
index d1d5301..bb83a2d 100644
--- a/arch/um/drivers/vector_kern.c
+++ b/arch/um/drivers/vector_kern.c
@@ -1156,8 +1156,10 @@ static int vector_net_open(struct net_device *dev)
 	struct vector_device *vdevice;
 
 	spin_lock_irqsave(&vp->lock, flags);
-	if (vp->opened)
+	if (vp->opened) {
+		spin_unlock_irqrestore(&vp->lock, flags);
 		return -ENXIO;
+	}
 	vp->opened = true;
 	spin_unlock_irqrestore(&vp->lock, flags);