MPI standard state that MPI_Win_f2c should return MPI_WIN_NULL if no windows correspond to the Fortran value.

As we dont have windows right now, I still raise the error but I return MPI_WIN_NULL.

This commit was SVN r3590.

src/mpi/c/win_f2c.c

@@ -31,5 +31,6 @@ MPI_Win MPI_Win_f2c(MPI_Fint win)
 
     /* This function is not yet implemented */
 
-  return (MPI_Win) OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_OTHER, FUNC_NAME);
+    (void)OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_OTHER, FUNC_NAME);
+    return MPI_WIN_NULL;
 }