crush: allow crush rules to set (re)tries counts to 0

These two fields are misnomers; they are *retry* counts.

Reflects ceph.git commit f17caba8ae0cad7b6f8f35e53e5f73b444696835.
Signed-off-by: NIlya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>

net/ceph/crush/mapper.c

@@ -684,12 +684,12 @@ int crush_do_rule(const struct crush_map *map,
 			break;
 
 		case CRUSH_RULE_SET_CHOOSE_LOCAL_TRIES:
-			if (curstep->arg1 > 0)
+			if (curstep->arg1 >= 0)
 				choose_local_retries = curstep->arg1;
 			break;
 
 		case CRUSH_RULE_SET_CHOOSE_LOCAL_FALLBACK_TRIES:
-			if (curstep->arg1 > 0)
+			if (curstep->arg1 >= 0)
 				choose_local_fallback_retries = curstep->arg1;
 			break;