clippy: shorten assignments

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/tape/drive/volume_statistics.rs

@@ -105,8 +105,8 @@ fn decode_volume_statistics(data: &[u8]) -> Result<Lp17VolumeStatistics, Error>
         let mut value: u64 = 0;
 
         for i in 0..len {
-            value = value << 8;
-            value = value | buffer[i] as u64;
+            value <<= 8;
+            value |= buffer[i] as u64;
         }
 
         Ok(value)

src/tape/helpers/blocked_writer.rs

@@ -77,7 +77,7 @@ impl <W: Write> BlockedWriter<W> {
             self.bytes_written += BlockHeader::SIZE;
 
         } else {
-            self.buffer_pos = self.buffer_pos + bytes;
+            self.buffer_pos += bytes;
         }
 
         Ok(bytes)