[animation] fix signedness warnings

diff --git a/src/libply-splash-graphics/ply-animation.c b/src/libply-splash-graphics/ply-animation.c
index 53639186b5cbfd0a1b593ebde46ec398dc2dda8b..343fe22c1bd0780072b2d2113b8069bc939a7c7d 100644 (file)
--- a/src/libply-splash-graphics/ply-animation.c
+++ b/src/libply-splash-graphics/ply-animation.c
@@ -219,8 +219,8 @@ ply_animation_add_frame (ply_animation_t *animation,
 
   ply_array_add_pointer_element (animation->frames, frame);
 
-  animation->width = MAX (animation->width, ply_pixel_buffer_get_width (frame));
-  animation->height = MAX (animation->height, ply_pixel_buffer_get_height (frame));
+  animation->width = MAX (animation->width, (long) ply_pixel_buffer_get_width (frame));
+  animation->height = MAX (animation->height,  (long) ply_pixel_buffer_get_height (frame));
 
   return true;
 }