cast_ptr_alignment: State alignment unit in lint message

Co-Authored-By: Philipp Krones <hello@philkrones.com>

Author: skade

clippy_lints/src/types.rs

@@ -1222,7 +1222,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Casts {
                         cx,
                         CAST_PTR_ALIGNMENT,
                         expr.span,
-                        &format!("casting from `{}` to a more-strictly-aligned pointer (`{}`) ({} < {})", cast_from, cast_to, from_align.bytes(), to_align.bytes())
+                        &format!("casting from `{}` to a more-strictly-aligned pointer (`{}`) ({} < {} bytes)", cast_from, cast_to, from_align.bytes(), to_align.bytes())
                     );
                 }
             }