staging: ccree: Replace kzalloc with devm_kzalloc

It is recommended to use managed function devm_kzalloc, which
simplifies driver cleanup paths and driver code.
This patch does the following:
(a) replace kzalloc with devm_kzalloc.
(b) drop kfree(), because memory allocated with devm_kzalloc() is
automatically freed on driver detach, otherwise it leads to a double
free.
(c) remove unnecessary blank lines.
Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
[gby: rebase on top of latest coding style fixes changes]
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ccree/ssi_driver.c

@@ -223,14 +223,15 @@ static int init_cc_resources(struct platform_device *plat_dev)
 	struct resource *req_mem_cc_regs = NULL;
 	void __iomem *cc_base = NULL;
 	bool irq_registered = false;
-	struct ssi_drvdata *new_drvdata = kzalloc(sizeof(*new_drvdata),
-						  GFP_KERNEL);
+	struct ssi_drvdata *new_drvdata;
 	struct device *dev = &plat_dev->dev;
 	struct device_node *np = dev->of_node;
 	u32 signature_val;
 	int rc = 0;
 
-	if (unlikely(!new_drvdata)) {
+	new_drvdata = devm_kzalloc(&plat_dev->dev, sizeof(*new_drvdata),
+				   GFP_KERNEL);
+	if (!new_drvdata) {
 		SSI_LOG_ERR("Failed to allocate drvdata");
 		rc = -ENOMEM;
 		goto init_cc_res_err;
@@ -435,10 +436,8 @@ static int init_cc_resources(struct platform_device *plat_dev)
 					   resource_size(new_drvdata->res_mem));
 			new_drvdata->res_mem = NULL;
 		}
-		kfree(new_drvdata);
 		dev_set_drvdata(&plat_dev->dev, NULL);
 	}
-
 	return rc;
 }
 
@@ -479,8 +478,6 @@ static void cleanup_cc_resources(struct platform_device *plat_dev)
 		drvdata->cc_base = NULL;
 		drvdata->res_mem = NULL;
 	}
-
-	kfree(drvdata);
 	dev_set_drvdata(&plat_dev->dev, NULL);
 }