TNT: Fix bug with huge stacks

This fixes the TNT bug that can crash game when blowing up a container
which holds huge stacks above the norm... e.g. give yourself 65535 snow,
place in chest, blow up, stalled!

mods/tnt/init.lua

@@ -47,7 +47,7 @@ end
 local function eject_drops(drops, pos, radius)
 	local drop_pos = vector.new(pos)
 	for _, item in pairs(drops) do
-		local count = item:get_count()
+		local count = math.min(item:get_count(), 99)
 		while count > 0 do
 			local take = math.max(1,math.min(radius * radius,
 					count,