Fixed a potential memory leak in mpi_type_create_struct_f

This commit was SVN r23484.

ompi/mpi/f77/type_create_struct_f.c

@@ -95,4 +95,6 @@ void mpi_type_create_struct_f(MPI_Fint *count,
     if (MPI_SUCCESS == OMPI_FINT_2_INT(*ierr)) {
         *newtype = MPI_Type_c2f(c_new);
     }
+
+    free(c_type_old_array);
 }