[Rust] Fix workflow example after recent changes

Author: emesare

rust/examples/workflow.rs

@@ -52,13 +52,17 @@ pub fn main() {
         binaryninja::headless::Session::new().expect("Failed to initialize session");
 
     println!("Registering workflow...");
-    let old_meta_workflow = Workflow::get("core.function.metaAnalysis");
+    let old_meta_workflow =
+        Workflow::get("core.function.metaAnalysis").expect("Couldn't find meta workflow");
     let meta_workflow = old_meta_workflow.clone_to("core.function.metaAnalysis");
     let activity = Activity::new_with_action(RUST_ACTIVITY_CONFIG, example_activity);
-    meta_workflow.register_activity(&activity).unwrap();
-    meta_workflow.insert("core.function.runFunctionRecognizers", [RUST_ACTIVITY_NAME]);
-    // Re-register the meta workflow with our changes.
-    meta_workflow.register().unwrap();
+    meta_workflow
+        .register_activity(&activity)
+        .expect("Couldn't register activity")
+        .insert("core.function.runFunctionRecognizers", [RUST_ACTIVITY_NAME])
+        .expect("Couldn't insert activity")
+        .register()
+        .expect("Couldn't register workflow");
 
     println!("Loading binary...");
     let bv = headless_session