Fix GH-14368: Test failure in ext/session/tests/gh13856.phpt (#14378)

If the runner overrides session.save_path, the test fails.
Manually set it to a value known to trigger the issue.

Fix GH-13856: Member access within null pointer of type 'ps_files' in ext/session/mod_files.c

We should not mark the session as opened when there was a failure in
open.

Closes G

Fix GH-13856: Member access within null pointer of type 'ps_files' in ext/session/mod_files.c

We should not mark the session as opened when there was a failure in
open.

Closes GH-13858.

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