[No-auto] bin/core/ref: Fix Clippy warnings

Signed-off-by: flip1995 <hello@philkrones.com>
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

bin/core/imag-ref/src/main.rs

@@ -69,9 +69,7 @@ fn main() {
                                     &version,
                                     "Reference files outside of the store",
                                     build_ui);
-    rt.cli()
-        .subcommand_name()
-        .map(|name| {
+    if let Some(name) = rt.cli().subcommand_name() {
         debug!("Call: {}", name);
         match name {
             "deref"     => deref(&rt),
@@ -86,7 +84,7 @@ fn main() {
                     .map(::std::process::exit);
             },
         };
-        });
+    }
 }
 
 fn deref(rt: &Runtime) {