Fix a few clippy warnings

src/float/add.rs

@@ -175,7 +175,8 @@ macro_rules! add {
             // correct result in that case.
             if round_guard_sticky > 0x4 { result += one; }
             if round_guard_sticky == 0x4 { result += result & one; }
-            return (<$ty>::from_repr(result.0));
+
+            <$ty>::from_repr(result.0)
         }
     }
 }

src/int/udiv.rs

@@ -191,8 +191,7 @@ pub extern "C" fn __udivmoddi4(n: u64, d: u64, rem: Option<&mut u64>) -> u64 {
         // 1 <= sr <= u32::bits() - 1
         q = n << (u64::bits() - sr);
         r = n >> sr;
-    } else {
-        if d.high() == 0 {
+    } else if d.high() == 0 {
         // K X
         // ---
         // 0 K
@@ -234,7 +233,6 @@ pub extern "C" fn __udivmoddi4(n: u64, d: u64, rem: Option<&mut u64>) -> u64 {
         q = n << (u64::bits() - sr);
         r = n >> sr;
     }
-    }
 
     // Not a special case
     // q and r are initialized with