[patch] possible null deref in init_usb_class()

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Add a missing goto.  We dereference usb_class on the next line.

Found by smatch static checker.

regards,
dan carpenter

Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>

--- orig/drivers/usb/core/file.c	2009-11-07 17:34:56.000000000 +0200
+++ devel/drivers/usb/core/file.c	2009-11-07 17:35:36.000000000 +0200
@@ -99,6 +99,7 @@
 		printk(KERN_ERR "class_create failed for usb devices\n");
 		kfree(usb_class);
 		usb_class = NULL;
+		goto exit;
 	}
 	usb_class->class->devnode = usb_devnode;
 
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