drm: fix warning on alpha

From: Andrew Morton <akpm@osdl.org>

On alpha:

drivers/char/drm/via_dmablit.h:44: error: field `direction' has incomplete type

Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

authored by Dave Airlie and committed by Dave Airlie 2185200c 4e4c62bd

+2
+2
drivers/char/drm/via_dmablit.h
··· 30 30 #ifndef _VIA_DMABLIT_H 31 31 #define _VIA_DMABLIT_H 32 32 33 + #include <linux/dma-mapping.h> 34 + 33 35 #define VIA_NUM_BLIT_ENGINES 2 34 36 #define VIA_NUM_BLIT_SLOTS 8 35 37