Fixes clippy complaining about return None instead of question marks

Author: akern40

src/impl_methods.rs

@@ -2299,10 +2299,7 @@ where
         let dim = dim.into_dimension();
 
         // Note: zero strides are safe precisely because we return an read-only view
-        let broadcast_strides = match upcast(&dim, &self.dim, &self.strides) {
-            Some(st) => st,
-            None => return None,
-        };
+        let broadcast_strides = upcast(&dim, &self.dim, &self.strides)?;
         unsafe { Some(ArrayView::new(self.ptr, dim, broadcast_strides)) }
     }
 

src/iterators/mod.rs

@@ -139,13 +139,9 @@ impl<A> DoubleEndedIterator for Baseiter<A, Ix1>
     #[inline]
     fn next_back(&mut self) -> Option<Self::Item>
     {
-        let index = match self.index {
-            None => return None,
-            Some(ix) => ix,
-        };
         self.dim[0] -= 1;
         let offset = Ix1::stride_offset(&self.dim, &self.strides);
-        if index == self.dim {
+        if self.index? == self.dim {
             self.index = None;
         }