ARM: IMX: remove unnecessary use of IS_ERR_VALUE()

device_register() returns -ve values for errors, and zero for success.
There's no need to obfuscate the code with IS_ERR_VALUE().
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-imx/devices/devices.c

@@ -37,7 +37,7 @@ int __init mxc_device_init(void)
 	int ret;
 
 	ret = device_register(&mxc_aips_bus);
-	if (IS_ERR_VALUE(ret))
+	if (ret < 0)
 		goto done;
 
 	ret = device_register(&mxc_ahb_bus);