Remove redundant error message in `fmpi_futhark_get_data_async()`

src/fmpi_futhark.c

@@ -229,7 +229,6 @@ void * fmpi_futhark_get_data_async(
     const size_t idx = FMPI_PRIV_FUTHARK_FUNC_IDX(dim_cnt, type);
     const int err = fmpi_futhark_get_data_func_list[idx](ctx, in, out);
     if(err != FUTHARK_SUCCESS) {
-        FMPI_RAISE_FUTHARK_ERROR(ctx, "futhark_values_##T##_##D##d() failed!");
         return NULL;
     }
     return out;