Check the count. It has to be a positive number.

This commit was SVN r12130.

ompi/mpi/c/get_count.c

@@ -39,7 +39,7 @@ int MPI_Get_count(MPI_Status *status, MPI_Datatype datatype, int *count)
 
    if (MPI_PARAM_CHECK) {
       OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
-      OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, 1);
+      OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, count);
 
       OMPI_ERRHANDLER_CHECK(rc, MPI_COMM_WORLD, rc, FUNC_NAME);
    }