zink: use uvec for undefs

Acked-by: Jordan Justen <jordan.l.justen@intel.com>
diff --git a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
index 20c72fd..c465a86 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
@@ -1063,7 +1063,7 @@
 static void
 emit_undef(struct ntv_context *ctx, nir_ssa_undef_instr *undef)
 {
-   SpvId type = get_fvec_type(ctx, undef->def.bit_size,
+   SpvId type = get_uvec_type(ctx, undef->def.bit_size,
                               undef->def.num_components);
 
    store_ssa_def_uint(ctx, &undef->def,