RDMA/nes: Fix possible array overrun

In nes_create_qp(), the test

	if (nesqp->mmap_sq_db_index > NES_MAX_USER_WQ_REGIONS) {

is used to error out if the db_index is too large; however, if the
test doesn't trigger, then the index is used as

	nes_ucontext->mmap_nesqp[nesqp->mmap_sq_db_index] = nesqp;

and mmap_nesqp is declared as

	struct nes_qp      *mmap_nesqp[NES_MAX_USER_WQ_REGIONS];

which leads to an array overrun if the index is exactly equal to
NES_MAX_USER_WQ_REGIONS.  Fix this by bailing out if the index is
greater than or equal to NES_MAX_USER_WQ_REGIONS.

This was spotted by the Coverity checker (CID 2162).
Acked-by: Glenn Streiff <gstreiff@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/nes/nes_verbs.c

@@ -1337,7 +1337,7 @@ static struct ib_qp *nes_create_qp(struct ib_pd *ibpd,
 								   NES_MAX_USER_WQ_REGIONS, nes_ucontext->first_free_wq);
 					/* nes_debug(NES_DBG_QP, "find_first_zero_biton wqs returned %u\n",
 							nespd->mmap_db_index); */
-					if (nesqp->mmap_sq_db_index > NES_MAX_USER_WQ_REGIONS) {
+					if (nesqp->mmap_sq_db_index >= NES_MAX_USER_WQ_REGIONS) {
 						nes_debug(NES_DBG_QP,
 							  "db index > max user regions, failing create QP\n");
 						nes_free_resource(nesadapter, nesadapter->allocated_qps, qp_num);