C++: Respond to review comments.

cpp/ql/test/query-tests/Critical/UnsafeUseOfThis/test.cpp

@@ -4,47 +4,47 @@ struct B;
 void call_f(B*);
 
 struct B : public A {
-	B() {
-		call_f(this);
-	}
+  B() {
+    call_f(this);
+  }
 
-    B(B& b) {
-        b.f(); // BAD: undefined behavior
-    }
+  B(B& b) {
+    b.f(); // BAD: undefined behavior
+  }
 
-	~B() {
-		f(); // BAD: undefined behavior
-	}
+  ~B() {
+    f(); // BAD: undefined behavior
+  }
 };
 
 struct C : public B {
-	C(bool b) {
-		call_f(this);
+  C(bool b) {
+    call_f(this);
 
-		if(b) {
-			this->f(); // GOOD: Not a 'must' flow
-		}
-	}
+    if(b) {
+      this->f(); // GOOD: Not a 'must' flow
+    }
+  }
 };
 
 struct D : public B {
-    D() : B(*this) {}
+  D() : B(*this) {}
 };
 
 void call_f(B* x) {
-	x->f(); // 2 x BAD: Undefined behavior
+  x->f(); // 2 x BAD: Undefined behavior
 }
 
 struct E : public A {
-	E() {
-		f(); // GOOD: Will call `E::f`
-	}
+  E() {
+    f(); // GOOD: Will call `E::f`
+  }
 
-	void f() override {}
+  void f() override {}
 };
 
 struct F : public E {
-	F() {
-		((A*)this)->f(); // BAD: undefined behavior
-	}
+  F() {
+    ((A*)this)->f(); // BAD: undefined behavior
+  }
 };