tty: omit need_resched() before cond_resched()

There's no need to call need_resched() because cond_resched() will do
nothing if need_resched() returns false.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Link: https://lore.kernel.org/r/5a11ad09-5508-933c-f044-6a236bf00557@redhat.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>