Fix unsigned overflow.

I'm not sure what exactly causes it, but there are some cases where
assImage->dst_x/y will be set when there is nothing to render, which
results in bad behavior.

Author: torque

src/ASSInspector.c

@@ -201,6 +201,10 @@ int assi_calculateBounds( ASSI_State *state, ASSI_Rect *rects, const int32_t *ti
 			}
 			assImage = assImage->next;
 		}
+
+		boundsRect.x2 = (boundsRect.x2 < boundsRect.x1)? boundsRect.x1: boundsRect.x2;
+		boundsRect.y2 = (boundsRect.y2 < boundsRect.y1)? boundsRect.y1: boundsRect.y2;
+
 		rects[i].x = boundsRect.x1;
 		rects[i].y = boundsRect.y1;
 		rects[i].w = boundsRect.x2 - boundsRect.x1;