Fix FP deallocuse (#5183)

Author: chrchr-github

lib/checkleakautovar.cpp

@@ -545,8 +545,10 @@ bool CheckLeakAutoVar::checkScope(const Token * const startToken,
                 }
                 closingParenthesis = closingParenthesis->linkAt(1);
                 if (Token::simpleMatch(closingParenthesis, "} else {")) {
-                    if (!checkScope(closingParenthesis->tokAt(2), varInfo2, notzero, recursiveCount))
-                        continue;
+                    if (!checkScope(closingParenthesis->tokAt(2), varInfo2, notzero, recursiveCount)) {
+                        varInfo.clear();
+                        return false;
+                    }
                     tok = closingParenthesis->linkAt(2)->previous();
                 } else {
                     tok = closingParenthesis->previous();

test/testleakautovar.cpp

@@ -2080,6 +2080,22 @@ class TestLeakAutoVar : public TestFixture {
               "    }\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        check("void f(node **p) {\n"
+              "    node* n = *p;\n"
+              "    if (n->left == NULL) {\n"
+              "        *p = n->right;\n"
+              "        free(n);\n"
+              "    }\n"
+              "    else if (n->right == NULL) {\n"
+              "        *p = n->left;\n"
+              "        free(n);\n"
+              "    }\n"
+              "    else {\n"
+              "        for (int i = 0; i < 4; ++i) {}\n"
+              "    }\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void mismatchAllocDealloc() {