irqchip/imx-intmux: Fix irqdata regs save in imx_intmux_runtime_suspend()

Gcc report warning as follows:

drivers/irqchip/irq-imx-intmux.c:316:29: warning:
 variable 'irqchip_data' set but not used [-Wunused-but-set-variable]
  316 |  struct intmux_irqchip_data irqchip_data;
      |                             ^~~~~~~~~~~~

irqdata regs is stored to this variable on the stack in
imx_intmux_runtime_suspend(), which means a nop. this commit
fix to save regs to the right place.

Fixes: bb403111 ("irqchip/imx-intmux: Implement intmux runtime power management")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200729155849.33919-1-weiyongjun1@huawei.com

drivers/irqchip/irq-imx-intmux.c

@@ -313,12 +313,12 @@ static int imx_intmux_remove(struct platform_device *pdev)
 static int imx_intmux_runtime_suspend(struct device *dev)
 {
 	struct intmux_data *data = dev_get_drvdata(dev);
-	struct intmux_irqchip_data irqchip_data;
+	struct intmux_irqchip_data *irqchip_data;
 	int i;
 
 	for (i = 0; i < data->channum; i++) {
-		irqchip_data = data->irqchip_data[i];
-		irqchip_data.saved_reg = readl_relaxed(data->regs + CHANIER(i));
+		irqchip_data = &data->irqchip_data[i];
+		irqchip_data->saved_reg = readl_relaxed(data->regs + CHANIER(i));
 	}
 
 	clk_disable_unprepare(data->ipg_clk);
@@ -329,7 +329,7 @@ static int imx_intmux_runtime_suspend(struct device *dev)
 static int imx_intmux_runtime_resume(struct device *dev)
 {
 	struct intmux_data *data = dev_get_drvdata(dev);
-	struct intmux_irqchip_data irqchip_data;
+	struct intmux_irqchip_data *irqchip_data;
 	int ret, i;
 
 	ret = clk_prepare_enable(data->ipg_clk);
@@ -339,8 +339,8 @@ static int imx_intmux_runtime_resume(struct device *dev)
 	}
 
 	for (i = 0; i < data->channum; i++) {
-		irqchip_data = data->irqchip_data[i];
-		writel_relaxed(irqchip_data.saved_reg, data->regs + CHANIER(i));
+		irqchip_data = &data->irqchip_data[i];
+		writel_relaxed(irqchip_data->saved_reg, data->regs + CHANIER(i));
 	}
 
 	return 0;