Python: Apply suggestions from code review

Co-authored-by: Taus <[email protected]>

Author: RasmusWL

python/ql/src/Security/CVE-2018-1281/BindToAllInterfaces.ql

@@ -54,10 +54,7 @@ DataFlow::Node vulnerableHostname(string hostname) {
 /** Gets a reference to tuple containing a hostname as the first element, that can be used to bind to all interfaces. */
 private DataFlow::LocalSourceNode vulnerableAddressTuple(DataFlow::TypeTracker t, string hostname) {
   t.start() and
-  exists(Tuple tup |
-    tup.getElt(0) = vulnerableHostname(hostname).asExpr() and
-    result.asExpr() = tup
-  )
+  result.asExpr() = any(Tuple tup | tup.getElt(0) = vulnerableHostname(hostname).asExpr())
   or
   // Due to bad performance when using normal setup with `vulnerableAddressTuple(t2, hostname).track(t2, t)`
   // we have inlined that code and forced a join