ipu_idmac: fix spinlock type

fix a probably accidently dropped reference operator while calling
spin_unlock_restore to an ipu lock.

Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Cc: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dma/ipu/ipu_idmac.c

@@ -729,7 +729,7 @@ static int ipu_init_channel_buffer(struct idmac_channel *ichan,
 
 	ichan->status = IPU_CHANNEL_READY;
 
-	spin_unlock_irqrestore(ipu->lock, flags);
+	spin_unlock_irqrestore(&ipu->lock, flags);
 
 	return 0;
 }