gpgscm: Guard use of union member.
* tests/gpgscm/scheme.c (opexe_5): Check that we have a file port before accessing filename. Fixes a crash on 32-bit architectures.
- Fixes-commit: e7429b1ced0c69fa7901f888f8dc25f00fc346a4
- Signed-off-by: Justus Winter <justus@g10code.com>