i915: fix wrong 'size_t' format string

For the fifteen bazillionth time.

See also commits f06da264cfb0f9444d41ca247213e419f90aa72a and
aeb565dfc3ac4c8b47c5049085b4c7bfb2c7d5d7 ("i915: Fix more size_t format
string warnings" and "Fix annoying DRM_ERROR() string warning").

Grr-target: Eric Anholt <eric@anholt.net>
Grr-target: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/gpu/drm/i915/i915_gem_debugfs.c

@@ -192,7 +192,7 @@ static int i915_gem_fence_regs_info(struct seq_file *m, void *data)
 
 			obj_priv = obj->driver_private;
 			seq_printf(m, "Fenced object[%2d] = %p: %s "
-				   "%08x %08x %08x %s %08x %08x %d",
+				   "%08x %08zx %08x %s %08x %08x %d",
 				   i, obj, get_pin_flag(obj_priv),
 				   obj_priv->gtt_offset,
 				   obj->size, obj_priv->stride,