scripts: Check the Rust formatting is valid

Check the rust formatting rather than just reformatting code on the CI
agent.

Also fix a formatting error that slipped in whilst the cargo fmt check
was not working correctly.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

src/main.rs

@@ -57,7 +57,8 @@ impl log::Log for Logger {
                 record.target(),
                 record.args()
             )
-        }.ok();
+        }
+        .ok();
     }
     fn flush(&self) {}
 }