MAINT: Fix clippy warnings about double references

These were instances of writing &&T where &T was enough (deref coercion
adjusts trivially, but it's better to avoid it).

Author: bluss

src/data_traits.rs

@@ -361,7 +361,7 @@ where
         } else {
             0
         };
-        self.clone_from(&other);
+        self.clone_from(other);
         self.as_nonnull_mut().offset(our_off)
     }
 }

src/impl_constructors.rs

@@ -227,7 +227,7 @@ where
     {
         let n = diag.len();
         let mut arr = Self::zeros((n, n));
-        arr.diag_mut().assign(&diag);
+        arr.diag_mut().assign(diag);
         arr
     }
 }

src/impl_methods.rs

@@ -2292,7 +2292,7 @@ where
             if let Some(self_s) = self.as_slice_memory_order_mut() {
                 if let Some(rhs_s) = rhs.as_slice_memory_order() {
                     for (s, r) in self_s.iter_mut().zip(rhs_s) {
-                        f(s, &r);
+                        f(s, r);
                     }
                     return;
                 }

src/impl_raw_views.rs

@@ -75,7 +75,7 @@ where
             assert!(!ptr.is_null(), "The pointer must be non-null.");
             if let Strides::Custom(strides) = &shape.strides {
                 dimension::strides_non_negative(strides).unwrap();
-                dimension::max_abs_offset_check_overflow::<A, _>(&dim, &strides).unwrap();
+                dimension::max_abs_offset_check_overflow::<A, _>(&dim, strides).unwrap();
             } else {
                 dimension::size_of_shape_checked(&dim).unwrap();
             }
@@ -217,7 +217,7 @@ where
             assert!(!ptr.is_null(), "The pointer must be non-null.");
             if let Strides::Custom(strides) = &shape.strides {
                 dimension::strides_non_negative(strides).unwrap();
-                dimension::max_abs_offset_check_overflow::<A, _>(&dim, &strides).unwrap();
+                dimension::max_abs_offset_check_overflow::<A, _>(&dim, strides).unwrap();
             } else {
                 dimension::size_of_shape_checked(&dim).unwrap();
             }

src/zip/mod.rs

@@ -252,7 +252,7 @@ where
     P: NdProducer<Dim = D>,
 {
     ndassert!(
-        part.equal_dim(&dimension),
+        part.equal_dim(dimension),
         "Zip: Producer dimension mismatch, expected: {:?}, got: {:?}",
         dimension,
         part.raw_dim()