[PATCH] Kernel Janitors patch to drivers_macintosh_ans-lcd.c

  Working on the Linux Kernel Janitors project, and following up on Mikal
  Still's work there, I'd like to submit a patch for the Macintosh ANS
  LCD driver.

  I believe from Mikal's Patches page that his previous patch was rejected
  due to not cleaning up properly. I believe my patch addresses this issue,
  by calling iounmap() to free the IO remapping created by ioremap() earlier
  in the function, if the call to misc_register() fails for any reason.

  Unfortunately I don't know how to get this driver to compile on my
  machine, and therefore I can't even check that my patch compiles. If you
  can advise me how to set my machine up to dompile these drivers, then
  please get in touch =) I hope I didn't make any stupid mistakes in this
  patch either.

drivers/macintosh/ans-lcd.c

@@ -140,6 +140,7 @@ int __init
 anslcd_init(void)
 {
 	int a;
+	int retval;
 	struct device_node* node;
 
 	node = find_devices("lcd");
@@ -150,7 +151,12 @@ anslcd_init(void)
 
 	anslcd_ptr = (volatile unsigned char*)ioremap(ANSLCD_ADDR, 0x20);
 	
-	misc_register(&anslcd_dev);
+	retval = misc_register(&anslcd_dev);
+	if(retval < 0){
+		printk(KERN_INFO "LCD: misc_register failed\n");
+		iounmap(anslcd_ptr);
+		return retval;
+	}
 
 #ifdef DEBUG
 	printk(KERN_DEBUG "LCD: init\n");