NFC: trf7970a: use to_spi_device

Use to_spi_device() instead of open-coding it.
Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/trf7970a.c

@@ -2139,7 +2139,7 @@ static int trf7970a_remove(struct spi_device *spi)
 #ifdef CONFIG_PM_SLEEP
 static int trf7970a_suspend(struct device *dev)
 {
-	struct spi_device *spi = container_of(dev, struct spi_device, dev);
+	struct spi_device *spi = to_spi_device(dev);
 	struct trf7970a *trf = spi_get_drvdata(spi);
 
 	dev_dbg(dev, "Suspend\n");
@@ -2155,7 +2155,7 @@ static int trf7970a_suspend(struct device *dev)
 
 static int trf7970a_resume(struct device *dev)
 {
-	struct spi_device *spi = container_of(dev, struct spi_device, dev);
+	struct spi_device *spi = to_spi_device(dev);
 	struct trf7970a *trf = spi_get_drvdata(spi);
 	int ret;
 
@@ -2174,7 +2174,7 @@ static int trf7970a_resume(struct device *dev)
 #ifdef CONFIG_PM
 static int trf7970a_pm_runtime_suspend(struct device *dev)
 {
-	struct spi_device *spi = container_of(dev, struct spi_device, dev);
+	struct spi_device *spi = to_spi_device(dev);
 	struct trf7970a *trf = spi_get_drvdata(spi);
 	int ret;
 
@@ -2191,7 +2191,7 @@ static int trf7970a_pm_runtime_suspend(struct device *dev)
 
 static int trf7970a_pm_runtime_resume(struct device *dev)
 {
-	struct spi_device *spi = container_of(dev, struct spi_device, dev);
+	struct spi_device *spi = to_spi_device(dev);
 	struct trf7970a *trf = spi_get_drvdata(spi);
 	int ret;