fix: remove cmp to calculate range

Author: granddaifuku

clippy_lints/src/loops/manual_memcpy.rs

@@ -12,7 +12,6 @@ use rustc_hir::{BinOpKind, Block, Expr, ExprKind, HirId, Pat, PatKind, StmtKind}
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, Ty};
 use rustc_span::symbol::sym;
-use std::cmp;
 use std::fmt::Display;
 use std::iter::Iterator;
 
@@ -475,7 +474,7 @@ fn is_array_length_equal_to_range(cx: &LateContext<'_>, start: &Expr<'_>, end: &
         };
 
         let range = match (extract_lit_value(start), extract_lit_value(end)) {
-            (Some(start_value), Some(end_value)) => cmp::max(start_value, end_value) - cmp::min(start_value, end_value),
+            (Some(start_value), Some(end_value)) => end_value - start_value,
             _ => return false,
         };