Added regression test for #11246 (#6399)

Reference: https://trac.cppcheck.net/ticket/11246

Author: orbitcowboy

test/testmemleak.cpp

@@ -2493,6 +2493,15 @@ class TestMemleakNoVar : public TestFixture {
               "}");
         ASSERT_EQUALS("", errout_str());
 
+        check("int f( void ) {\n" // FP: #11246
+              "  void* address = malloc( 1 );\n"
+              "  int ok = address != 0;\n"
+              "  if ( ok )\n"
+              "    free( address ), address = 0;\n"
+              "  return 0;\n"
+              "} ");
+        ASSERT_EQUALS("", errout_str());
+
         check("char** x(const char* str) {\n"
               "    char* ptr[] = { malloc(10), malloc(5), strdup(str) };\n"
               "    return ptr;\n"