Issue #1706: Fixing Static Analyzer Warnings

- Several unread assignments have been fixed.
- [Minor memory leaks](https://github.com/wordpress-mobile/WordPress-iOS/commit/f30c034b248ba1a930b43b2b033bca7eaa5f6425) have been found & fixed.
- Found & fixed a [missing variable assignment](https://github.com/wordpress-mobile/WordPress-iOS/commit/65a5c7001f1c10091423d68039e4e196e2dd9f5d)