fix many clippy warnings (#33510)

Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>

components/script/dom/gamepadhapticactuator.rs

@@ -96,7 +96,7 @@ impl GamepadHapticActuator {
         }
         Self {
             reflector_: Reflector::new(),
-            gamepad_index: gamepad_index,
+            gamepad_index,
             effects,
             playing_effect_promise: DomRefCell::new(None),
             sequence_id: Cell::new(0),

components/script/dom/htmlimageelement.rs

@@ -7,7 +7,7 @@ use std::collections::HashSet;
 use std::default::Default;
 use std::rc::Rc;
 use std::sync::{Arc, Mutex};
-use std::{char, i32, mem};
+use std::{char, mem};
 
 use app_units::{Au, AU_PER_PX};
 use base::id::PipelineId;

components/script/dom/htmllinkelement.rs

@@ -656,9 +656,7 @@ impl LinkProcessingOptions {
         assert!(!self.href.is_empty());
 
         // Step 2. If options's destination is null, then return null.
-        let Some(destination) = self.destination else {
-            return None;
-        };
+        let destination = self.destination?;
 
         // Step 3. Let url be the result of encoding-parsing a URL given options's href, relative to options's base URL.
         // TODO: The spec passes a base url which is incompatible with the

components/script/dom/xmlhttprequest.rs

@@ -478,7 +478,7 @@ impl XMLHttpRequestMethods for XMLHttpRequest {
         let name_str = name.as_str().ok_or(Error::Syntax)?;
 
         // Step 5: If (name, value) is a forbidden request-header, then return.
-        if is_forbidden_request_header(name_str, &value) {
+        if is_forbidden_request_header(name_str, value) {
             return Ok(());
         }
 

components/script/dom/xrreferencespaceevent.rs

@@ -114,11 +114,9 @@ impl XRReferenceSpaceEventMethods for XRReferenceSpaceEvent {
 
     /// <https://www.w3.org/TR/webxr/#dom-xrreferencespaceevent-transform>
     fn GetTransform(&self) -> Option<DomRoot<XRRigidTransform>> {
-        if let Some(ref transform) = self.transform {
-            Some(DomRoot::from_ref(&**transform))
-        } else {
-            None
-        }
+        self.transform
+            .as_ref()
+            .map(|transform| DomRoot::from_ref(&**transform))
     }
 
     /// <https://dom.spec.whatwg.org/#dom-event-istrusted>