fix the pointer cast issue in CPMA.hpp

[RomaLzhih]

The malloc returns the raw pointer, which needs to be explicitly cast to the desired type to avoid a compile issue in C++20.

[wheatman]

What compiler version and build target/ flag combination do you see this issue on?
And is it a warning or an error.
It builds clean for me using c++20 on clang 20 with no warnings.
It also builds using gcc 13.2, though this one has many warnings.

I want to make sure to build and test all configurations

[RomaLzhih]

This compilation error arises when I try to extend the BYO.

I am using g++ 14.2.1.

To reproduce, you can try cloning my fork and running

bazel build benchmarks/run_structures:run_pcsr 

Below is the error message on my side:

external/cpma/PMA/CPMA.hpp|1185 col 17| error: invalid conversion from 'void*' to 'void**' [-fpermissive]
||  1185 |           malloc(offsets_array.size * sizeof(*(offsets_array.locations)));
||       |           ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
||       |                 |
||       |                 void*
external/cpma/PMA/CPMA.hpp|1187 col 17| error: invalid conversion from 'void*' to 'unsigned int*' [-fpermissive]
||  1187 |           malloc(offsets_array.size * sizeof(*(offsets_array.degrees)));
||       |           ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
||       |                 |
||       |                 void*
|| Target //benchmarks/run_structures:run_pcsr failed to build

I have noticed that there are several similar pointer-type changes in the same file, yet the compiler reports no errors.

Thanks very much!