arch/x86: Fix return_if_fail() regression
arch/x86: Fix return_if_fail() regression

If tty_putc() fails, it calls return_if_fail(), which in turn calls
tty_putc(). This breaks the infinite loop by instead having the tty
subsystem fail silently.

ChrisCummins/euclid,ChrisCummins/euclid,ChrisCummins/euclid