Address Clippy complaints.

src/commands/pczt/qr.rs

@@ -254,11 +254,8 @@ impl<'b, C> minicbor::Decode<'b, C> for ZcashPczt {
         cbor_map(d, &mut result, |key, obj, d| {
             let key =
                 u8::try_from(key).map_err(|e| minicbor::decode::Error::message(e.to_string()))?;
-            match key {
-                DATA => {
-                    obj.data = d.bytes()?.to_vec();
-                }
-                _ => {}
+            if key == DATA {
+                obj.data = d.bytes()?.to_vec();
             }
             Ok(())
         })?;

src/commands/wallet/sync/defrag.rs

@@ -246,7 +246,7 @@ impl App {
             // Determine the density of blocks we will be rendering. Use ceiling division
             // to ensure we don't require more cells than we have (which would cause the
             // blocks around the chain tip to never be rendered).
-            let area = u32::from(defrag_area.area());
+            let area = defrag_area.area();
             let blocks_per_cell = (block_count + area - 1) / area;
             let blocks_per_row = blocks_per_cell * u32::from(defrag_area.width);