[AD] Memory bitmaps badly broken

[Trent Gamblin <trent@xxxxxxxxxx>]

I just updated my local checkout for the
first time in a week or more, so I'm not
sure when this happened, but one of the
tools I'm using stopped working. I wrote
a test case and it exhibits the same
behaviour:

#include <allegro5/allegro.h>
#include <allegro5/allegro_image.h>

int main(void)
{
	al_init();
	al_init_image_addon();

	ALLEGRO_DISPLAY *d = al_create_display(800, 600);
	al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
	ALLEGRO_BITMAP *b = al_load_bitmap("layer1.png");

	al_clear_to_color(al_map_rgb(255, 255, 255));
	al_draw_bitmap(b, 0, 0, 0);
	al_flip_display();
	al_rest(5);

	return 0;
}

I tried with 2 different images and they both
looked liked they had the same problem. Here
is the image anyway:

http://trent.gamblin.ca/temp/layer1.png

And what the output looks like:

http://trent.gamblin.ca/temp/bug.png

I'm running OS X.