/*D
   MPI_Type_free_keyval - Frees an attribute key for datatypes

Synopsis:
.vb
int MPI_Type_free_keyval(int *type_keyval)
.ve

Input/Output Parameters:
. type_keyval - key value (integer)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_KEYVAL
.N MPI_ERR_OTHER

D*/

