GCC backend: Remove add_eval if no function is created

Author: GuillaumeGomez

src/allocator.rs

@@ -158,7 +158,6 @@ fn create_wrapper_function(
         }
     } else {
         assert!(output.is_none());
-        block.add_eval(None, ret);
         block.end_with_void_return(None);
     }