[PATCH] Fix some compile warnings

From: "Martin J. Bligh" <mbligh@aracnet.com>

Fix a couple of instances of "warning: suggest parentheses around assignment
used as truth value".

drivers/base/cpu.c

@@ -49,8 +49,12 @@ int __init register_cpu(struct cpu *cpu, int num, struct node *root)
 int __init cpu_dev_init(void)
 {
 	int error;
-	if (!(error = devclass_register(&cpu_devclass)))
-		if ((error = driver_register(&cpu_driver)))
+
+	error = devclass_register(&cpu_devclass);
+	if (!error) {
+		error = driver_register(&cpu_driver);
+		if (error)
 			devclass_unregister(&cpu_devclass);
+	}
 	return error;
 }

drivers/base/memblk.c

@@ -50,9 +50,13 @@ int __init register_memblk(struct memblk *memblk, int num, struct node *root)
 int __init register_memblk_type(void)
 {
 	int error;
-	if (!(error = devclass_register(&memblk_devclass)))
-		if (error = driver_register(&memblk_driver))
+
+	error = devclass_register(&memblk_devclass);
+	if (!error) {
+		error = driver_register(&memblk_driver);
+		if (error)
 			devclass_unregister(&memblk_devclass);
+	}
 	return error;
 }
 postcore_initcall(register_memblk_type);

drivers/base/node.c

@@ -92,9 +92,13 @@ int __init register_node(struct node *node, int num, struct node *parent)
 int __init register_node_type(void)
 {
 	int error;
-	if (!(error = devclass_register(&node_devclass)))
-		if (error = driver_register(&node_driver))
+	
+	error = devclass_register(&node_devclass);
+	if (!error) {
+		error = driver_register(&node_driver);
+		if (error)
 			devclass_unregister(&node_devclass);
+	}
 	return error;
 }
 postcore_initcall(register_node_type);