[PATCH] tlclk: fix platform_device_register_simple() error check

The return value of platform_device_register_simple() should be checked by
IS_ERR().

This patch also fix misc_register() error case.  Because misc_register()
returns error code.

Cc: Sebastien Bouchard <sebastien.bouchard@ca.kontron.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/tlclk.c

@@ -792,15 +792,14 @@ static int __init tlclk_init(void)
 	ret = misc_register(&tlclk_miscdev);
 	if (ret < 0) {
 		printk(KERN_ERR "tlclk: misc_register returns %d.\n", ret);
-		ret = -EBUSY;
 		goto out3;
 	}
 
 	tlclk_device = platform_device_register_simple("telco_clock",
 				-1, NULL, 0);
-	if (!tlclk_device) {
+	if (IS_ERR(tlclk_device)) {
 		printk(KERN_ERR "tlclk: platform_device_register failed.\n");
-		ret = -EBUSY;
+		ret = PTR_ERR(tlclk_device);
 		goto out4;
 	}