Rollup merge of rust-lang#121543 - onur-ozkan:clippy-args, r=oli-obk

various clippy fixes

We need to keep the order of the given clippy lint rules before passing them.
Since clap doesn't offer any useful interface for this purpose out of the box,
we have to handle it manually.

Additionally, this PR makes `-D` rules work as expected. Previously, lint rules were limited to `-W`. By enabling `-D`, clippy began to complain numerous lines in the tree, all of which have been resolved in this PR as well.

Fixes rust-lang#121481
cc `@matthiaskrgr`

Author: matthiaskrgr

std/src/io/buffered/bufreader.rs

@@ -328,10 +328,9 @@ impl<R: ?Sized + Read> Read for BufReader<R> {
             self.discard_buffer();
             return self.inner.read_vectored(bufs);
         }
-        let nread = {
-            let mut rem = self.fill_buf()?;
-            rem.read_vectored(bufs)?
-        };
+        let mut rem = self.fill_buf()?;
+        let nread = rem.read_vectored(bufs)?;
+
         self.consume(nread);
         Ok(nread)
     }