Merge pull request github#12426 from github/redsun82/cpp-file-permissions-example

C++: fix example code for `FilePermissions.qll`

Author: redsun82

cpp/ql/src/Security/CWE/CWE-732/DoNotCreateWorldWritable.c

@@ -1,11 +1,11 @@
-int write_default_config_bad() {
+void write_default_config_bad() {
 	// BAD - this is world-writable so any user can overwrite the config
-	FILE* out = creat(OUTFILE, 0666);
-	fprintf(out, DEFAULT_CONFIG);
+	int out = creat(OUTFILE, 0666);
+	dprintf(out, DEFAULT_CONFIG);
 }
 
-int write_default_config_good() {
+void write_default_config_good() {
 	// GOOD - this allows only the current user to modify the file
-	FILE* out = creat(OUTFILE, S_IWUSR | S_IRUSR);
-	fprintf(out, DEFAULT_CONFIG);
+	int out = creat(OUTFILE, S_IWUSR | S_IRUSR);
+	dprintf(out, DEFAULT_CONFIG);
 }