fixup append_to_builder

Signed-off-by: Andrew Duffy <andrew@a10y.dev>

Author: a10y

vortex-array/src/arrays/patched/vtable/mod.rs

@@ -212,8 +212,6 @@ impl VTable for Patched {
             let output = typed_builder.values_mut();
             let trailer = output.len() - len;
 
-            let trailer = values.len() - len;
-
             apply_patches_primitive::<V>(
                 &mut output[trailer..],
                 offset,