fix clippy issues

examples/basic/src/main.rs

@@ -24,7 +24,7 @@ async fn main() -> Result<(), Error> {
     // ========================================================================
     // Setting an event callback to be executed each time a message is received
     node2
-        .set_event_callback(&|response| {
+        .set_event_callback(|response| {
             if let LibwakuResponse::Success(v) = response {
                 let event: Event =
                     serde_json::from_str(v.unwrap().as_str()).expect("Parsing event to succeed");
@@ -47,7 +47,7 @@ async fn main() -> Result<(), Error> {
         .expect("set event call back working");
 
     node1
-        .set_event_callback(&|response| {
+        .set_event_callback(|response| {
             if let LibwakuResponse::Success(v) = response {
                 let event: Event =
                     serde_json::from_str(v.unwrap().as_str()).expect("Parsing event to succeed");

waku-bindings/src/node/context.rs

@@ -4,15 +4,17 @@ use std::sync::{Arc, Mutex};
 
 use crate::utils::{get_trampoline, LibwakuResponse};
 
+type LibwakuResponseClosure = dyn FnMut(LibwakuResponse) + Send + Sync;
+
 pub struct WakuNodeContext {
     obj_ptr: *mut c_void,
-    msg_observer: Arc<Mutex<Box<dyn FnMut(LibwakuResponse) + Send + Sync>>>,
+    msg_observer: Arc<Mutex<Box<LibwakuResponseClosure>>>,
 }
 
 impl WakuNodeContext {
     pub fn new(obj_ptr: *mut c_void) -> Self {
         let me = Self {
-            obj_ptr: obj_ptr,
+            obj_ptr,
             msg_observer: Arc::new(Mutex::new(Box::new(|_| {}))),
         };
 
@@ -54,9 +56,7 @@ impl WakuNodeContext {
             };
             Ok(())
         } else {
-            Err(format!(
-                "Failed to acquire lock in waku_set_event_callback!"
-            ))
+            Err("Failed to acquire lock in waku_set_event_callback!".to_string())
         }
     }
 }

waku-bindings/src/node/filter.rs

@@ -89,13 +89,11 @@ pub fn waku_filter_unsubscribe_all(ctx: &WakuNodeContext) -> Result<()> {
     let code = unsafe {
         let mut closure = result_cb;
         let cb = get_trampoline(&closure);
-        let out = waku_sys::waku_filter_unsubscribe_all(
+        waku_sys::waku_filter_unsubscribe_all(
             ctx.get_ptr(),
             cb,
             &mut closure as *mut _ as *mut c_void,
-        );
-
-        out
+        )
     };
 
     handle_no_response(code, result)