fix mistake

Author: andjsrk

clippy_lints/src/missing_asserts_for_indexing.rs

@@ -124,6 +124,10 @@ impl<'hir> AssertionSide<'hir> {
             None
         }
     }
+    pub fn asserted_len_from_expr(cx: &LateContext<'_>, expr: &'hir Expr<'hir>) -> Option<Self> {
+        Self::asserted_len_from_int_lit_expr(expr)
+            .or_else(|| Self::asserted_len_from_possibly_const_expr(cx, expr))
+    }
     pub fn asserted_len_from_int_lit_expr(expr: &'hir Expr<'hir>) -> Option<Self> {
         if let ExprKind::Lit(Spanned {
             node: LitKind::Int(Pu128(x), _),
@@ -168,7 +172,7 @@ fn len_comparison<'hir>(
         if let Some(left) = AssertionSide::asserted_len_from_int_lit_expr(left) {
             Some((left, AssertionSide::from_expr(cx, right)?))
         } else if let Some(left) = AssertionSide::slice_len_from_expr(cx, left) {
-            Some((left, AssertionSide::from_expr(cx, right)?))
+            Some((left, AssertionSide::asserted_len_from_expr(cx, right)?))
         } else {
             Some((
                 AssertionSide::asserted_len_from_possibly_const_expr(cx, left)?,