Where did the phrase "In like Flint" come from?

I'm pretty sure that the quote is 'In like Flynn' and originated during Errol Flynn's statuatory rape trial.

See this webpage for more information about this phrase:
https://www.imdb.com/title/tt0061810/trivia

By the way, James Coburn played Derek Flint in a couple of James Bond clones in the sixties, OUR MAN FLINT and IN LIKE FLINT, which may be where you heard that version of the phrase In Like Flynn.

I agree it is 'In like Flynn'. My book of word and phrase origins says "Chicago's 'Boss' Flynn's machine never lost an election and was always 'in office' inspiring the expression In like Flynn, meaning to have it made. The popularity of movie actor Errol Flynn and his amorous activities helped popularize the phrase in the early 1940's." That is quoted exactly as it is in the phrase origin book.