mfd: kzalloc doesn't return ERR_PTR

Use !x rather than IS_ERR(x) to test the result of kzalloc.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,E;
@@

x = \(kmalloc\|kzalloc\|kcalloc\)(...)
... when != x = E
- IS_ERR(x)
+ !x
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/abx500-core.c

@@ -36,7 +36,7 @@ int abx500_register_ops(struct device *dev, struct abx500_ops *ops)
 	struct abx500_device_entry *dev_entry;
 
 	dev_entry = kzalloc(sizeof(struct abx500_device_entry), GFP_KERNEL);
-	if (IS_ERR(dev_entry)) {
+	if (!dev_entry) {
 		dev_err(dev, "register_ops kzalloc failed");
 		return -ENOMEM;
 	}