remove saturating_sub

Author: relaxcn

clippy_lints/src/write.rs

@@ -610,9 +610,9 @@ fn relocalize_format_args_indexes(
         }
 
         // lambda to get the decremented index based on the replaced positions
-        let decremented_index = |index: usize| {
+        let decremented_index = |index: usize| -> usize {
             let decrement = replaced_position.iter().filter(|&&i| i < index).count();
-            index.saturating_sub(decrement)
+            index - decrement
         };
 
         suggestion.push((*span, decremented_index(*index).to_string()));