module: remove rmmod --wait option.
The option to wait for a module reference count to reach zero was in the initial module implementation, but it was never supported in modprobe (you had to use rmmod --wait). After discussion with Lucas, It has been deprecated (with a 10 second sleep) in kmod for the last year. This finally removes it: the flag will evoke a printk warning and a normal (non-blocking) remove attempt. Cc: Lucas De Marchi <email@example.com> Signed-off-by: Rusty Russell <firstname.lastname@example.org>
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