DRM: remove unused dev_class

The struct class_device *dev_class is not used in the struct drm_head
structure at all, so remove it as class_device is being removed entirely
from the kernel.


Cc: David Airlie <[email protected]>
Cc: Tony Jones <[email protected]>
Cc: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/char/drm/drmP.h

@@ -640,7 +640,6 @@ struct drm_head {
 	struct drm_device *dev;
 	struct proc_dir_entry *dev_root;  /**< proc directory entry */
 	dev_t device;			/**< Device number for mknod */
-	struct class_device *dev_class;
 };
 
 /**