Fix several needless_borrow clippy lints.

src/bin/cargo/cli.rs

@@ -102,7 +102,7 @@ Run with 'cargo -Z [FLAG] [SUBCOMMAND]'"
         }
     };
     config_configure(config, &args, subcommand_args)?;
-    super::init_git_transports(&config);
+    super::init_git_transports(config);
 
     execute_subcommand(config, cmd, subcommand_args)
 }

src/cargo/core/compiler/mod.rs

@@ -1008,7 +1008,7 @@ pub fn extern_args<'a>(
 
     for dep in deps {
         if dep.unit.target.linkable() && !dep.unit.mode.is_doc() {
-            link_to(&dep, dep.extern_crate_name, dep.noprelude)?;
+            link_to(dep, dep.extern_crate_name, dep.noprelude)?;
         }
     }
     if unit.target.proc_macro()

src/cargo/util/config/de.rs

@@ -291,11 +291,11 @@ impl<'de, 'config> de::MapAccess<'de> for ConfigMapAccess<'config> {
         // Set this as the current key in the deserializer.
         let field = match field {
             KeyKind::Normal(field) => {
-                self.de.key.push(&field);
+                self.de.key.push(field);
                 field
             }
             KeyKind::CaseSensitive(field) => {
-                self.de.key.push_sensitive(&field);
+                self.de.key.push_sensitive(field);
                 field
             }
         };

src/cargo/util/config/mod.rs

@@ -832,7 +832,7 @@ impl Config {
         for arg in cli_args {
             // TODO: This should probably use a more narrow parser, reject
             // comments, blank lines, [headers], etc.
-            let toml_v: toml::Value = toml::de::from_str(&arg)
+            let toml_v: toml::Value = toml::de::from_str(arg)
                 .chain_err(|| format!("failed to parse --config argument `{}`", arg))?;
             let toml_table = toml_v.as_table().unwrap();
             if toml_table.len() != 1 {

src/cargo/util/config/target.rs

@@ -113,7 +113,7 @@ fn parse_links_overrides(
                 "rustc-flags" => {
                     let flags = value.string(key)?;
                     let whence = format!("target config `{}.{}` (in {})", target_key, key, flags.1);
-                    let (paths, links) = BuildOutput::parse_rustc_flags(&flags.0, &whence)?;
+                    let (paths, links) = BuildOutput::parse_rustc_flags(flags.0, &whence)?;
                     output.library_paths.extend(paths);
                     output.library_links.extend(links);
                 }