Fix #4478: FP: Uninitialized variable (#6493)

Author: olabetskyi

lib/astutils.cpp

@@ -3415,6 +3415,8 @@ ExprUsage getExprUsage(const Token* tok, int indirect, const Settings& settings)
         if (isUsedAsBool(tok, settings))
             return ExprUsage::NotUsed;
     }
+    if (tok->isUnaryOp("&") && !parent)
+        return ExprUsage::NotUsed;
     if (indirect == 0) {
         if (Token::Match(parent, "%cop%|%assign%|++|--") && parent->str() != "=" &&
             !parent->isUnaryOp("&") &&

test/testuninitvar.cpp

@@ -4304,7 +4304,7 @@ class TestUninitVar : public TestFixture {
                         "    long a;\n"
                         "    &a;\n"
                         "}");
-        TODO_ASSERT_EQUALS("", "[test.cpp:3]: (error) Uninitialized variable: &a\n", errout_str());
+        ASSERT_EQUALS("", errout_str());
 
         valueFlowUninit("void f() {\n" // #4717 - ({})
                         "    int a = ({ long b = (long)(123); 2 + b; });\n"