clippy: misc. fixes

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

src/tape/drive/encryption.rs

@@ -24,10 +24,7 @@ pub fn has_encryption<F: AsRawFd>(
         Ok(data) => data,
         Err(_) => return false,
     };
-    match decode_spin_data_encryption_caps(&data) {
-        Ok(_) => true,
-        Err(_) => false,
-    }
+    decode_spin_data_encryption_caps(&data).is_ok()
 }
 
 /// Set or clear encryption key

src/tape/drive/tape_alert_flags.rs

@@ -17,6 +17,7 @@ bitflags::bitflags!{
     ///
     /// See LTO SCSI Reference LOG_SENSE - LP 2Eh: TapeAlerts
     pub struct TapeAlertFlags: u64 {
+        #[allow(clippy::eq_op)]
         const READ_WARNING = 1 << (0x0001 -1);
         const WRITE_WARNING = 1 << (0x0002 -1);
         const HARD_ERROR = 1 << (0x0003 -1);

src/tape/sgutils2.rs

@@ -201,7 +201,7 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
 
         let data_len = self.buffer.len() -
             (unsafe { get_scsi_pt_resid(&mut *ptvp) } as usize);
-        if data_len <= 0 {
+        if data_len == 0 {
             bail!("do_scsi_pt failed - no data received");
         }