Fix #12399 FP doubleFree for fclose in macro with __typeof__ (#5928)

Author: chrchr-github

lib/checkleakautovar.cpp

@@ -468,6 +468,10 @@ bool CheckLeakAutoVar::checkScope(const Token * const startToken,
 
             const Token * closingParenthesis = tok->linkAt(1);
             for (const Token *innerTok = tok->tokAt(2); innerTok && innerTok != closingParenthesis; innerTok = innerTok->next()) {
+                if (isUnevaluated(innerTok)) {
+                    innerTok = innerTok->linkAt(1);
+                    continue;
+                }
                 // TODO: replace with checkTokenInsideExpression()
                 const Token* const openingPar = isFunctionCall(innerTok);
                 if (!openingPar)

test/testleakautovar.cpp

@@ -1701,6 +1701,16 @@ class TestLeakAutoVar : public TestFixture {
               "    y = fclose(f);\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        check("void f() {\n"
+              "    FILE *fp = fopen(\"abc\", \"r\");\n"
+              "    if (({\n"
+              "        __typeof__(fclose(fp)) r;\n"
+              "        r = (fclose(fp));\n"
+              "        r;\n"
+              "    })) {}\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void exit1() {