range the while loop, just in case

kamailio/nat-traversal-role.cfg

@@ -11,7 +11,11 @@ route[NAT_TEST_AND_CORRECT]
 {
     if (is_present_hf("Record-Route")) {
         $var(i) = $rr_count;
-        while($var(i) > 0) {
+        ## We witnessed this loop execute more than
+        ##   500 times, probably do to inability to
+        ##   allocate rr_count or the parser.  Either
+        ##   way ensure the while loop is not unbound'd
+        while($var(i) > 0 && $var(i) < 30) {
             $var(i) = $var(i) - 1;
             $var(rr) = $(hdr(Record-Route)[$var(i)]);
             if (!is_myself("$(var(rr){nameaddr.uri})")) {