ASoC: Acknowledge WM8996 interrupts before acting on them

This closes the small race between a status being read in response to an
interrupt and clearing the interrupt, meaning that if the status changes
between those periods we might not get a reassertion of the interrupt.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8996.c

@@ -2404,6 +2404,8 @@ static irqreturn_t wm8996_irq(int irq, void *data)
 	}
 	irq_val &= ~snd_soc_read(codec, WM8996_INTERRUPT_STATUS_2_MASK);
 
+	snd_soc_write(codec, WM8996_INTERRUPT_STATUS_2, irq_val);
+
 	if (irq_val & (WM8996_DCS_DONE_01_EINT | WM8996_DCS_DONE_23_EINT)) {
 		dev_dbg(codec->dev, "DC servo IRQ\n");
 		complete(&wm8996->dcs_done);
@@ -2420,13 +2422,10 @@ static irqreturn_t wm8996_irq(int irq, void *data)
 	if (irq_val & WM8996_MICD_EINT)
 		wm8996_micd(codec);
 
-	if (irq_val) {
-		snd_soc_write(codec, WM8996_INTERRUPT_STATUS_2, irq_val);
-
+	if (irq_val)
 		return IRQ_HANDLED;
-	} else {
+	else
 		return IRQ_NONE;
-	}
 }
 
 static irqreturn_t wm8996_edge_irq(int irq, void *data)