misc: block: streamline error Display::fmt()

The changes were mostly automatically applied using the Python
script mentioned in the first commit of this series.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

block/src/fcntl.rs

@@ -28,7 +28,7 @@ pub enum LockError {
     #[error("The file is already locked")]
     AlreadyLocked,
     /// IO error.
-    #[error("The lock state could not be checked or set: {0}")]
+    #[error("The lock state could not be checked or set")]
     Io(#[source] io::Error),
 }