fix false positive introduced by previous false negative fix commit

lib/checkautovariables.cpp

@@ -168,7 +168,7 @@ void CheckAutoVariables::autoVariables()
             else if (Token::Match(tok, "return & %var% ;") && tok->tokAt(2)->varId())
             {
                 const Variable * var1 = symbolDatabase->getVariableFromVarId(tok->tokAt(2)->varId());
-                if (var1 && var1->isArgument())
+                if (var1 && var1->isArgument() && var1->typeEndToken()->str() != "&")
                     errorReturnAddressOfFunctionParameter(tok, tok->strAt(2));
             }
             // Invalid pointer deallocation

test/testautovariables.cpp

@@ -593,6 +593,13 @@ private:
               "}\n");
 
         ASSERT_EQUALS("[test.cpp:3]: (error) Return the address of function parameter 'y'\n", errout.str());
+
+        check("const int * foo(const int & y)\n"
+              "{\n"
+              "  return &y;\n"
+              "}\n");
+
+        ASSERT_EQUALS("", errout.str());
     }
 
 };