axonram: Return directly after a failed kzalloc() in axon_ram_probe()

* Return directly after a call of the function "kzalloc" failed
  at the beginning.

* Delete a repeated check for the local variable "bank"
  which became unnecessary with this refactoring.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/sysdev/axonram.c

@@ -192,10 +192,8 @@ static int axon_ram_probe(struct platform_device *device)
 			device->dev.of_node);
 
 	bank = kzalloc(sizeof(*bank), GFP_KERNEL);
-	if (bank == NULL) {
-		rc = -ENOMEM;
-		goto failed;
-	}
+	if (!bank)
+		return -ENOMEM;
 
 	device->dev.platform_data = bank;
 
@@ -291,7 +289,6 @@ static int axon_ram_probe(struct platform_device *device)
 	return 0;
 
 failed:
-	if (bank != NULL) {
 	if (bank->irq_id)
 		free_irq(bank->irq_id, device);
 	if (bank->disk != NULL) {
@@ -308,8 +305,6 @@ static int axon_ram_probe(struct platform_device *device)
 	if (bank->io_addr != 0)
 		iounmap((void __iomem *) bank->io_addr);
 	kfree(bank);
-	}
-
 	return rc;
 }