drm/qxl: don't allocate a dma_address array

That seems to be unused.

Daniel: Mike reported a warning when booting with qxl, which this
patch fixes:

[ 1.815561] WARNING: CPU: 7 PID: 355 at drivers/gpu/drm/ttm/ttm_pool.c:365 ttm_pool_alloc+0x41b/0x540 [ttm]

Signed-off-by: Christian König <[e-mail]>
Reported-by: Mike Galbraith <[e-mail]>
Tested-by: Mike Galbraith <[e-mail]>
References: https://lore.kernel.org/lkml/[e-mail]/
Reviewed-by: David Airlie <[e-mail]>
[davnet: bring commit message up to par.]
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/qxl/qxl_ttm.c

···
 	ttm = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 	if (ttm == NULL)
 		return NULL;
-	if (ttm_dma_tt_init(ttm, bo, page_flags, ttm_cached)) {
+	if (ttm_tt_init(ttm, bo, page_flags, ttm_cached)) {
 		kfree(ttm);
 		return NULL;
 	}