Remove unnecessary clippy attribute.

Author: nnethercote

crates/spirv-std/macros/src/lib.rs

@@ -196,8 +196,6 @@ pub fn gpu_only(_attr: TokenStream, item: TokenStream) -> TokenStream {
         block,
     } = syn::parse_macro_input!(item as syn::ItemFn);
 
-    // FIXME(eddyb) this looks like a clippy false positive (`sig` is used below).
-    #[allow(clippy::redundant_clone)]
     let fn_name = sig.ident.clone();
 
     let sig_cpu = syn::Signature {