ASoC: intel: restore IRQs on error

This should be spin_unlock_irqrestore() instead of spin_unlock()

Fixes: 22981243 ('ASoC: Intel: Add Haswell/Broadwell IPC')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/intel/sst-haswell-ipc.c

@@ -527,7 +527,7 @@ static int ipc_tx_message(struct sst_hsw *hsw, u32 header, void *tx_data,
 
 	msg = msg_get_empty(hsw);
 	if (msg == NULL) {
-		spin_unlock(&hsw->dsp->spinlock);
+		spin_unlock_irqrestore(&hsw->dsp->spinlock, flags);
 		return -EBUSY;
 	}