block: streamline error messages

In [0] we agreed on the current format.

[0] https://github.com/cloud-hypervisor/cloud-hypervisor/pull/7066

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

block/src/formats/vhdx/internal/header.rs

@@ -40,7 +40,7 @@ pub enum VhdxHeaderError {
     DuplicateBATEntry,
     #[error("Metadata region entry is not unique")]
     DuplicateMDREntry,
-    #[error("Checksum doesn't match for")]
+    #[error("Checksum doesn't match for {0}")]
     InvalidChecksum(String),
     #[error("Invalid entry count")]
     InvalidEntryCount,

block/src/lib.rs

@@ -55,7 +55,7 @@ use crate::request::SECTOR_SIZE;
 pub enum Error {
     #[error("Guest gave us bad memory addresses")]
     GuestMemory(#[source] GuestMemoryError),
-    #[error("Guest gave us offsets that would have overflowed a usize")]
+    #[error("Guest address {0:?} with sector offset {1} would overflow a usize")]
     CheckedOffset(GuestAddress, usize /* sector offset */),
     #[error("Guest gave us a write only descriptor that protocol says to read from")]
     UnexpectedWriteOnlyDescriptor,