ATM: fix compiler warnings about unused variables

javascript/ql/experimental/adaptivethreatmodeling/lib/experimental/adaptivethreatmodeling/EndpointScoring.qll

@@ -118,6 +118,7 @@ class EndpointScoringResults extends ScoringResults {
 
   pragma[inline]
   override predicate shouldResultBeIncluded(DataFlow::Node source, DataFlow::Node sink) {
+    exists(source) and
     if getCfg().isKnownSink(sink)
     then any()
     else (

javascript/ql/experimental/adaptivethreatmodeling/lib/experimental/adaptivethreatmodeling/TaintedPathATM.qll

@@ -125,6 +125,6 @@ class BarrierGuardNodeAsSanitizerGuardNode extends TaintTracking::LabeledSanitiz
   }
 
   override predicate sanitizes(boolean outcome, Expr e, DataFlow::FlowLabel label) {
-    sanitizes(outcome, e)
+    sanitizes(outcome, e) and exists(label)
   }
 }

javascript/ql/experimental/adaptivethreatmodeling/modelbuilding/extraction/ExtractEndpointData.qll

@@ -193,7 +193,7 @@ module FlowFromSource {
 
     /** The sinks are the endpoints we're extracting. */
     override predicate isSink(DataFlow::Node sink, DataFlow::FlowLabel lbl) {
-      sink = getAnEndpoint(q)
+      sink = getAnEndpoint(q) and exists(lbl)
     }
   }
 }