drm/i915: Initialise mmaped_count for i915_gem_object_info

Reported-by: 0day kbuild test robot
Fixes: 2bd160a131ac ("drm/i915: Reduce i915_gem_objects to only show...")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1471263496-27537-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -403,7 +403,9 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
 		   dev_priv->mm.object_count,
 		   dev_priv->mm.object_memory);
 
-	size = count = purgeable_size = purgeable_count = 0;
+	size = count = 0;
+	mapped_size = mapped_count = 0;
+	purgeable_size = purgeable_count = 0;
 	list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_list) {
 		size += obj->base.size;
 		++count;