Fixed crash when checking tinyxml introduced by previous commit
Don't complain "could not find or open any of the paths given." if no arguments were passed to cppcheck (and help was shown)
Refactorizations:
- Removed some duplicate nullpointer checks
- Simplified tok->link() on '<' usage.
Refactorizations:
- Simplified pattern ".|->" to "."
- Use nextArgument() where appropriate
Internal checking is now enabled by the macro CHECK_INTERNAL