rust-1.83: Fix issues due to new compiler version

The compiler now generates panics in a few places that it would know how
to handle previously.

Signed-off-by: Arthur Heymans <arthur.heymans@9elements.com>

drivers/src/printer.rs

@@ -68,8 +68,19 @@ impl uDisplay for HexBytes<'_> {
     where
         W: uWrite + ?Sized,
     {
-        for byte in self.0.iter() {
-            ufmt::uwrite!(f, "{:02X}", *byte)?;
+        for &x in self.0.iter() {
+            let c = x >> 4;
+            if c < 10 {
+                f.write_char((c + b'0') as char)?;
+            } else {
+                f.write_char((c - 10 + b'A') as char)?;
+            }
+            let c = x & 0xf;
+            if c < 10 {
+                f.write_char((c + b'0') as char)?;
+            } else {
+                f.write_char((c - 10 + b'A') as char)?;
+            }
         }
         Ok(())
     }

runtime/src/authorize_and_stash.rs

@@ -118,6 +118,10 @@ impl AuthorizeAndStashCmd {
             .image_metadata_list
             .binary_search_by(|metadata| metadata.fw_id.cmp(&cmd_fw_id))
             .ok()
-            .map(|index| &auth_manifest_image_metadata_col.image_metadata_list[index])
+            .map(|index| {
+                auth_manifest_image_metadata_col
+                    .image_metadata_list
+                    .get(index)
+            })?
     }
 }