IB/mthca: Remove "stop" flag for catastrophic error polling timer

Since we use del_timer_sync() anyway, there's no need for an
additional flag to tell the timer not to rearm.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/mthca/mthca_dev.h

@@ -277,7 +277,6 @@ struct mthca_mcg_table {
 struct mthca_catas_err {
 	u64			addr;
 	u32 __iomem	       *map;
-	unsigned long		stop;
 	u32			size;
 	struct timer_list	timer;
 	struct list_head	list;