Update rust/ql/lib/codeql/rust/dataflow/internal/DataFlowImpl.qll

Co-authored-by: Tom Hvitved <hvitved@github.com>

Author: paldepind

rust/ql/lib/codeql/rust/dataflow/internal/DataFlowImpl.qll

@@ -1024,10 +1024,9 @@ module RustDataFlow implements InputSig<Location> {
 
   /** Holds if `creation` is an expression that creates a lambda of kind `kind` for `c`. */
   predicate lambdaCreation(Node creation, LambdaCallKind kind, DataFlowCallable c) {
-    exists(Expr cl |
+    exists(ClosureExpr cl |
       cl = creation.asExpr().getExpr() and
-      cl = c.asCfgScope() and
-      cl instanceof ClosureExpr
+      cl = c.asCfgScope()
     ) and
     exists(kind)
   }