ompi/datatype: fix how we compute the space needed for the args#6331

bwbarrett merged 1 commit intoopen-mpi:v3.1.xopen-mpi/ompi:v3.1.xfrom

ggouaillardet:topic/v3.1.x/ompi_datatype_set_argsggouaillardet/ompi:topic/v3.1.x/ompi_datatype_set_argsCopy head branch name to clipboard