JS: fix indefinite check on callback

Author: asger-semmle

javascript/ql/src/semmle/javascript/dataflow/internal/FlowSteps.qll

@@ -35,7 +35,7 @@ predicate calls(DataFlow::InvokeNode invk, Function f) {
 private predicate partiallyCalls(DataFlow::AdditionalPartialInvokeNode invk, DataFlow::AnalyzedNode callback, Function f) {
   invk.isPartialArgument(callback, _, _) and
   exists (AbstractFunction callee | callee = callback.getAValue() |
-    if invk.isIndefinite("global") then
+    if callback.getAValue().isIndefinite("global") then
       (f = callee.getFunction() and f.getFile() = invk.getFile())
     else
       f = callee.getFunction()