opensm/osm_mcast_mgr.c: fix osm_mcast_mgr_compute_max_hops for managed switch

If a certain mcast group has only one member, and this member is a switch, OSM fails to select this switch when trying to create spanning tree for this mcast group:

ERR 0A08: Unable to locate a suitable switch for group 0xC000 ERR 0A17: Unable to create spanning tree (IB_ERROR) for mlid 0xc000

---
V2: no need to handle the case with no
members in mcast group, it is already
handled by the caller function.

 opensm/opensm/osm_mcast_mgr.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

index 697fb58..6bcbec4 100644
@@ -215,11 +215,9 @@ static float osm_mcast_mgr_compute_max_hops(osm_sm_t * sm, cl_qlist_t * l,
 			max_hops = hops;
 	}
 
-	if (max_hops == 0)
-		/*
-		   We should be here if there aren't any ports in the group.
-		 */
-		max_hops = 10001;	/* see later - we use it to realize no hops */
+	/* Note that at this point we might get (max_hops == 0),
+	   which means that there's only one member in the mcast
+	   group, and it's the current switch */
 
 	OSM_LOG_EXIT(sm->p_log);
 	return (float)max_hops;

1.5.1.4

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Applied. Thanks.

Sasha
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