ADIOS2_USE_Endian_Reverse Broken

[ax3l]

@eschnett reported in Spack that -DADIOS2_USE_Endian_Reverse=ON is broken: spack/spack#23643

adios2/helper/adiosMemory.cpp:32:22: error: no match for 'operator==' (operand types are 'const adios2::DataType' and 'const char [1]')
   32 |         if (destType == "")
      |             ~~~~~~~~ ^~ ~~
      |             |           |
      |             |           const char [1]
      |             const adios2::DataType

I can reproduce this with the latest master as of d654782

cmake -S . -B build -DADIOS2_USE_Endian_Reverse=ON
cmake --build build

cc @pnorbert @chuckatkins

[ax3l]

I guess the right comparison would be something like destType == DataType::None or so?

[germasch]

Yes, this should be destType == DataType::None, and it might even be that it was me who broke it. If so, a real long time ago...

[ax3l]

Thanks, fix in #2701 :)