[PATCH] IB/mthca: Set QP static rate correctly

Fix offset of static_rate in QP context.  Pointed out by Dror Goldenberg.

Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>