[PATCH] maple_tree: Fix potential NULL pointer dereference if mas_pop_node() fails

[Matthew Wilcox]

On Sun, Oct 19, 2025 at 07:49:16PM +0800, Huiwen He wrote:
> Hi Markus,
> 
> Thanks for your suggestion.
> The commit description could be improved to better follow the imperative style.
> I'll update it in the later version (maybe v2). 

Do not send a v2 until somebody has a substantive comment.  I suspect
that what you are doing here is wrong, but I lack the understanding to
explain why it is wrong.