Merge #143: Remove redundant slicing

d63557f Remove redundant slicing (Tobin Harding)

Pull request description:

  Clippy emits:

  warning: redundant slicing of the whole range

  As suggested use `key` directly instead of the slice.

ACKs for top commit:
  apoelstra:
    ACK d63557f

Tree-SHA512: 4055f101b99b0f15ac856a0520107eac7d7ac320d9f893ac6f865c23ae44934639141efd9ffb7dc0d2e6a0898896edd800b989988313f614f7b52e2d834eb9a8

Author: apoelstra

src/hmac.rs

@@ -85,10 +85,10 @@ impl<T: HashTrait> HmacEngine<T> {
                 *b_o ^= *b_h;
             }
         } else {
-            for (b_i, b_h) in ipad.iter_mut().zip(&key[..]) {
+            for (b_i, b_h) in ipad.iter_mut().zip(key) {
                 *b_i ^= *b_h;
             }
-            for (b_o, b_h) in opad.iter_mut().zip(&key[..]) {
+            for (b_o, b_h) in opad.iter_mut().zip(key) {
                 *b_o ^= *b_h;
             }
         };