From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

This patch fixes a typo preventing channel B from working on the Rx path of
pmac zilog (never calling tty_flip_*).  I think I never tested channel B :)

Thanks to Hollis Blanchard for spotting the bug.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>