transpile: always cast bitfield accesses to expected type

Author: fw-immunant

c2rust-transpile/src/translator/operators.rs

@@ -310,12 +310,7 @@ impl<'c> Translation<'c> {
         };
 
         if let Some(field_id) = bitfield_id {
-            let rhs_expr = if compute_lhs_type_id.ctype == initial_lhs_type_id.ctype {
-                rhs_translation.to_expr()
-            } else {
-                mk().cast_expr(rhs_translation.to_expr(), ty)
-            };
-
+            let rhs_expr = mk().cast_expr(rhs_translation.to_expr(), ty);
             return self.convert_bitfield_assignment_op_with_rhs(ctx, op, lhs, rhs_expr, *field_id);
         }