Update std.c

Author: chrchr-github

test/cfg/std.c

@@ -386,6 +386,16 @@ void resourceLeak_tmpfile(void)
     // cppcheck-suppress resourceLeak
 }
 
+void resourceLeak_freopen(FILE* f1)
+{
+    if (freopen(NULL, "w+b", f1) == NULL) {} // #14171
+
+    FILE *f2 = fopen("file.txt", "r");
+    // cppcheck-suppress [ignoredReturnValue, nullPointerOutOfResources]
+    freopen("file.txt", "r", f2);
+    // cppcheck-suppress resourceLeak
+}
+
 // memory leak
 
 void ignoreleak(void)