style: cargo fmt, once, so it can be checked from here on

No change but layout. Kept apart from everything else so that blame
can skip it (git config blame.ignoreRevsFile) and no real change hides
in it.

src/throttle.rs

@@ -30,7 +30,10 @@ const MAX_DELAY: i64 = 30;
 fn delay_after(failures: u32) -> i64 {
     match failures.checked_sub(FREE_ATTEMPTS) {
         None | Some(0) => 0,
-        Some(over) => 1i64.checked_shl(over - 1).unwrap_or(MAX_DELAY).min(MAX_DELAY),
+        Some(over) => 1i64
+            .checked_shl(over - 1)
+            .unwrap_or(MAX_DELAY)
+            .min(MAX_DELAY),
     }
 }
 
@@ -114,10 +117,16 @@ mod tests {
         let throttle = LoginThrottle::default();
         // Made directly: past the free attempts `begin` would make them wait.
         for _ in 0..10 {
-            Attempt { throttle: &throttle }.failed();
+            Attempt {
+                throttle: &throttle,
+            }
+            .failed();
         }
         assert!(throttle.begin().is_err());
-        Attempt { throttle: &throttle }.succeeded();
+        Attempt {
+            throttle: &throttle,
+        }
+        .succeeded();
         assert!(throttle.begin().is_ok());
     }