Although it was checking the per-character error flags supplied by the
driver for ordinary characters, the ppp_async line discipline code wasn't
checking the flags for special characters, such as the flag and escape
characters (~ and }).  This patch adds that check.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>