C++: Fix Code Scanning errors.

Author: MathiasVP

cpp/ql/src/Likely Bugs/Format/NonConstantFormat.ql

@@ -68,9 +68,9 @@ predicate cannotContainString(Type t, boolean isIndirect) {
 
 predicate isNonConst(DataFlow::Node node, boolean isIndirect) {
   exists(Expr e |
-    e = [node.asExpr()] and isIndirect = false
+    e = node.asExpr() and isIndirect = false
     or
-    e = [node.asIndirectExpr()] and isIndirect = true
+    e = node.asIndirectExpr() and isIndirect = true
   |
     exists(FunctionCall fc | fc = e |
       not (