[PATCH proxmox-backup 7/9] datastore: simplify FixedIndexReader::chunk_info

[Robert Obkircher <r.obkircher@proxmox.com>]

This is mainly done so the index_length field can be removed.

Signed-off-by: Robert Obkircher <r.obkircher@proxmox.com>
---
 pbs-datastore/src/fixed_index.rs | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/pbs-datastore/src/fixed_index.rs b/pbs-datastore/src/fixed_index.rs
index 1d3d0170a..29927aeba 100644
--- a/pbs-datastore/src/fixed_index.rs
+++ b/pbs-datastore/src/fixed_index.rs
@@ -165,18 +165,11 @@ impl IndexFile for FixedIndexReader {
     }
 
     fn chunk_info(&self, pos: usize) -> Option<ChunkReadInfo> {
-        if pos >= self.index_length {
-            return None;
-        }
+        let digest = self.index_digest(pos)?;
 
         let start = (pos * self.chunk_size) as u64;
-        let mut end = start + self.chunk_size as u64;
-
-        if end > self.size {
-            end = self.size;
-        }
+        let end = (start + self.chunk_size as u64).min(self.size);
 
-        let digest = self.index_digest(pos).unwrap();
         Some(ChunkReadInfo {
             range: start..end,
             digest: *digest,
-- 
2.47.3