Altix serial: fix

In function sn_sal_switch_to_asynch(): drivers/serial/sn_console.c:713:

HZ * SN_SAL_UART_FIFO_DEPTH / SN_SAL_UART_FIFO_SPEED_CPS;

After preprocessing (see defines in patch) this becomes HZ * 16 / 9600 / 10
(associativity from left to right), not equivalent to HZ * 16 / 960.

Looks-obviously-right-to: Tony Luck <tony.luck@intel.com>
Cc: Jes Sorensen <jes@sgi.com>
Acked-by: Pat Gefre <pfg@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>