drm/vc4: Fix wrong printk format in vc4_bo_stats_debugfs()

vc4->purgeable.size and vc4->purgeable.purged_size are size_t fields
and should be printed with a %zd specifier.

Fixes: b9f19259 ("drm/vc4: Add the DRM_IOCTL_VC4_GEM_MADVISE ioctl")
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20171101095731.14878-1-boris.brezillon@free-electrons.com
(cherry picked from commit 50f365cd)
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/vc4/vc4_bo.c

@@ -88,11 +88,11 @@ int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
 
 	mutex_lock(&vc4->purgeable.lock);
 	if (vc4->purgeable.num)
-		seq_printf(m, "%30s: %6dkb BOs (%d)\n", "userspace BO cache",
+		seq_printf(m, "%30s: %6zdkb BOs (%d)\n", "userspace BO cache",
 			   vc4->purgeable.size / 1024, vc4->purgeable.num);
 
 	if (vc4->purgeable.purged_num)
-		seq_printf(m, "%30s: %6dkb BOs (%d)\n", "total purged BO",
+		seq_printf(m, "%30s: %6zdkb BOs (%d)\n", "total purged BO",
 			   vc4->purgeable.purged_size / 1024,
 			   vc4->purgeable.purged_num);
 	mutex_unlock(&vc4->purgeable.lock);