Fix segfault in rs_stack_mark #100
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I have no context over that gem, but a crash and gdb session
show us marking an empty stack:
```
(gdb) p *stack
$1 = {capacity = 0, top = 0, contents = 0x0}
```
Since we iterate with `i <= top`, we try to mark a NULL pointer
when the stack is empty.
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I have no context over that gem, but a crash and gdb session show us marking an empty stack:
Since we iterate with
i <= top, we try to mark a NULL pointer when the stack is empty.