fix test failure

removed wrong assertation code

Author: iwa0

src/raw/mod.rs

@@ -231,9 +231,6 @@ fn calculate_layout<T>(buckets: usize) -> Option<(Layout, usize)> {
     // Group::WIDTH is a small number.
     let ctrl = unsafe { Layout::from_size_align_unchecked(buckets + Group::WIDTH, Group::WIDTH) };
 
-    // There must be no padding between two tables.
-    debug_assert_eq!(data.padding_needed_for(Group::WIDTH), 0);
-
     data.extend(ctrl).ok()
 }