Fix a typo to avoid an infinite loop when dealing with unexpected code.
Fix a typo to avoid an infinite loop when dealing with unexpected code.

TranslationUnit._search_content() must update the index to give the next char,
not the current, when an unterminated string or comment is encountered.

edlund/amalgamate,edlund/amalgamate,edlund/amalgamate,edlund/amalgamate