Add missing definition of MPI_T_PVAR_SESSION_NULL (resolve #2652) #3102
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This pull resolves #2652 by adding the missing definition of
MPI_T_PVAR_SESSION_NULL. It also corrects an issue withMPI_T_pvar_session_free()so as to match the man page description.The only user-visible difference of the pull is that
MPI_T_pvar_session_free()will now correctly fail with a return value ofMPI_T_ERR_INVALID_SESSIONwhen thesessionparameter is not valid (that is, whenMPI_T_PVAR_SESSION_NULL == session.