Fix op_ref warning

Compare rust-lang/rust-clippy#2597

bignum/src/lib.rs

@@ -530,17 +530,17 @@ where
     for<'a1, 'a2> &'a1 T: NumOps<&'a2 T, T>,
 {
     fn ceil_quotient(&self, k: &Self) -> Self {
-        assert!(k > &Self::zero());
+        assert!(*k > Self::zero());
         &(&(self + k) - &Self::one()) / k
     }
 
     fn floor_quotient(&self, k: &Self) -> Self {
-        assert!(k > &Self::zero());
+        assert!(*k > Self::zero());
         self / k
     }
 
     fn remainder(&self, k: &Self) -> Self {
-        assert!(k > &Self::zero());
+        assert!(*k > Self::zero());
 
         let mut r = self % k;
         if r < Self::zero() {
@@ -550,7 +550,7 @@ where
     }
 
     fn root(&self, k: usize) -> (Self, bool) {
-        assert!(self > &Self::zero(), "base is not positive");
+        assert!(*self > Self::zero(), "base is not positive");
         assert!(k > 0, "exponent is not positive");
 
         let one = Self::one();

dsa/src/lib.rs

@@ -1,5 +1,3 @@
-#![cfg_attr(feature="cargo-clippy", feature(tool_lints))]
-
 extern crate bignum;
 extern crate num_traits;
 extern crate rsa;
@@ -44,13 +42,12 @@ where
         self.secret_key_from_k(m1, s1, &k)
     }
 
-    #[cfg_attr(feature = "cargo-clippy", allow(clippy::op_ref))]
     pub fn verify_signature(&self, m: &T, &Signature { ref r, ref s }: &Signature<T>) -> bool {
         let zero = T::zero();
         let p = &self.params.p;
         let q = &self.params.q;
         let g = &self.params.g;
-        if r <= &zero || r >= q || s <= &zero || s >= q {
+        if *r <= zero || r >= q || *s <= zero || s >= q {
             return false;
         }
         let w = T::invmod(s, q).unwrap();