Fix port:call function to return an error if the target process is no longer alive

[fadushin]

This change set changes the behavior of the internally used port:call function, to return an error if the target process is no longer alive.

Signed-off-by: Fred Dushin [email protected]

These changes are made under both the "Apache 2.0" and the "GNU Lesser General Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

[fadushin]

Corrected formatting