mfd: tps65090: Add error prints when mem alloc failed

Add error prints when memory allocation failed for
tps65090 data. Also cleanups the melloc arguments.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/tps65090.c b/drivers/mfd/tps65090.c
index 9b79d68..f95f7f6 100644
--- a/drivers/mfd/tps65090.c
+++ b/drivers/mfd/tps65090.c
@@ -263,10 +263,11 @@
 		return -EINVAL;
 	}
 
-	tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090),
-		GFP_KERNEL);
-	if (tps65090 == NULL)
+	tps65090 = devm_kzalloc(&client->dev, sizeof(*tps65090), GFP_KERNEL);
+	if (!tps65090) {
+		dev_err(&client->dev, "mem alloc for tps65090 failed\n");
 		return -ENOMEM;
+	}
 
 	tps65090->client = client;
 	tps65090->dev = &client->dev;