[ MallocSizeofChecker ] - False positive about MallocSizeofChecker

Hi all,
I encountered a false positive when using the MallocSizeofChecker, but I am not sure whether it can be called false positives.

Given the below code sippet:

I think it works perfectly correct here. There is a reason why the
common idiom is to use sizeof(*ptr) in this case.

Joerg