[PATCH] Char: mxser_new, upgrade to 1.9.15

- allow special rates
- break when bad status

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>