Revert "driver core: refcounting fix"

This reverts commit 63ce18cf.

It was the incorrect fix and causes a reference counting bug whenever
any driver module is removed from the system. Mike Galbraith
<efault@gmx.de> is looking for the real fix for his problem.
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

kernel/module.c

@@ -2419,12 +2419,6 @@ void module_remove_driver(struct device_driver *drv)
 			kfree(driver_name);
 		}
 	}
-	/*
-	 * Undo the additional reference we added in module_add_driver()
-	 * via kset_find_obj()
-	 */
-	if (drv->mod_name)
-		kobject_put(&drv->kobj);
 }
 EXPORT_SYMBOL(module_remove_driver);
 #endif