Bug in filenames() and dir_entries()

[zodiacon]

There's a bug, where p is incremented with ++p on every iteration. This is wrong... The ++p needs to be removed from the for loops.

[andy-thomason]

Thanks, Pavel. I'll take a look.

[andy-thomason]

I've pushed a change but haven't had time to test it.

I haven't had a look at this code for a while. Feel free to check it and give feedback.