heap.png issue

During debug, I find something inconsistent when referring to this flow graph of heap.

It seems the "Yes/No" option in the first branch of SYSMALLOC should be swapped,
 according to glibc source.
<https://github.com/lattera/glibc/blob/master/malloc/malloc.c#L2279>
（This glibc version is old. But just for reference）