drm/legacy: Fix type for drm_local_map.offset

drm_local_map.offset is not only used for resource_size_t but also
dma_addr_t which may be of different sizes.

Reported-by: Nathan Chancellor <[email protected]>
Fixes: 8e4ff9b ("drm: Remove the dma_alloc_coherent wrapper for internal usage")
Tested-by: Nathan Chancellor <[email protected]> # build
Signed-off-by: Chris Wilson <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Linus Torvalds <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: ickle

include/drm/drm_legacy.h

@@ -136,7 +136,7 @@ struct drm_sg_mem {
  * Kernel side of a mapping
  */
 struct drm_local_map {
-	resource_size_t offset;	 /**< Requested physical address (0 for SAREA)*/
+	dma_addr_t offset;	 /**< Requested physical address (0 for SAREA)*/
 	unsigned long size;	 /**< Requested physical size (bytes) */
 	enum drm_map_type type;	 /**< Type of memory to map */
 	enum drm_map_flags flags;	 /**< Flags */