[PATCH 4.9 10/77] tty: fix __tty_insert_flip_char regression

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Arnd Bergmann commit 8a5a90a2a477b86a3dc2eaa5a706db9bfdd647ca upstream. Sergey noticed a small but fatal mistake in __tty_insert_flip_char, leading to an oops in an interrupt

[PATCH 4.9 10/77] tty: fix __tty_insert_flip_char regression

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Arnd Bergmann commit 8a5a90a2a477b86a3dc2eaa5a706db9bfdd647ca upstream. Sergey noticed a small but fatal mistake in __tty_insert_flip_char, leading to an oops in an interrupt handler when