fix: incomplete check only mode

The implementation of the check only mode was incomplete

src/lib.rs

@@ -377,6 +377,10 @@ impl Wish {
     pub fn listen(&self) {
         rstk::mainloop();
     }
+
+    pub fn destroy(&self) {
+        rstk::end_wish();
+    }
 }
 
 impl Frontend for Wish {

src/main.rs

@@ -40,6 +40,11 @@ fn main() {
                     process::exit(1);
                 });
 
+            // End the program if check only.
+            if args.check {
+                frontend.destroy();
+            }
+
             if let Err(e) = run(clafrica_conf, frontend.clone()) {
                 frontend.raise_error("Application error", &e.to_string());
                 process::exit(1);