Merge pull request #2360 from pguyot/w29/fix-unix-uart-spec

Raise consistently on avm_unix uart:open/1,2 failure

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

Author: bettio

libs/avm_unix/src/uart.erl

@@ -91,7 +91,7 @@ open(Opts) ->
                     {Pid, Fd};
                 {error, _} = CfgErr ->
                     atomvm:posix_close(Fd),
-                    CfgErr
+                    error(CfgErr)
             end;
         {error, Reason} ->
             error(Reason)