chore: remove unnecessary parentheses around type

Author: tesuji

clippy_lints/src/mutex_atomic.rs

@@ -77,7 +77,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Mutex {
     }
 }
 
-fn get_atomic_name(ty: Ty<'_>) -> Option<(&'static str)> {
+fn get_atomic_name(ty: Ty<'_>) -> Option<&'static str> {
     match ty.kind {
         ty::Bool => Some("AtomicBool"),
         ty::Uint(_) => Some("AtomicUsize"),

clippy_lints/src/utils/mod.rs

@@ -239,7 +239,7 @@ pub fn match_path_ast(path: &ast::Path, segments: &[&str]) -> bool {
 }
 
 /// Gets the definition associated to a path.
-pub fn path_to_res(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<(def::Res)> {
+pub fn path_to_res(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<def::Res> {
     let crates = cx.tcx.crates();
     let krate = crates
         .iter()