Actually it can make a difference in two ways.

The first is that if you put a return before some code that you want executed, it won't be because you returned.

The second is that if you just use a true value but don't return, and accidentally put some executable code after it (eg a variable initialization) with a false value, then your module will fail to load.

Both should be obvious if you are bitten by them. But I like putting the true return value at the end anyways.