damage: Update tail pointer after allocating new chunk

Reported and based on a patch by fmot.fics

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=53384
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/cairo-damage.c b/src/cairo-damage.c
index 06ef9fdf..61a58af0 100644
--- a/src/cairo-damage.c
+++ b/src/cairo-damage.c
@@ -128,10 +128,11 @@ _cairo_damage_add_boxes(cairo_damage_t *damage,
     chunk->count = count;
 
     damage->tail->next = chunk;
-    damage->remain = size - count;
+    damage->tail = chunk;
 
     memcpy (damage->tail->base, boxes + n,
 	    count * sizeof (cairo_box_t));
+    damage->remain = size - count;
 
     return damage;
 }