mfd: tps65912: Convert to managed resources for allocating memory

Saves on code and simplifies the driver, as these resources are now
tracked and freed automatically when the driver is realised.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/tps65912-spi.c b/drivers/mfd/tps65912-spi.c
index b45f460..69a5178 100644
--- a/drivers/mfd/tps65912-spi.c
+++ b/drivers/mfd/tps65912-spi.c
@@ -85,7 +85,8 @@
 {
 	struct tps65912 *tps65912;
 
-	tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL);
+	tps65912 = devm_kzalloc(&spi->dev,
+				sizeof(struct tps65912), GFP_KERNEL);
 	if (tps65912 == NULL)
 		return -ENOMEM;