USB: serial: remove hupping check from tiocmiwait
Since commit 31ca020b ("TTY: wake up processes last at hangup") there no longer any need to check the hupping flag in the generic tiocmiwait implementation, so remove it. Signed-off-by: NJohan Hovold <jhovold@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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