tu: Do not emit zero-sized fs params

The comparison change accidentally slipped in.

Fixes a crash in:
  dEQP-VK.subgroups.size_control.framebuffer.fragment_allow_varying_subgroup_size

Fixes: 76e417ca593866080731da59c479a99542e3a529
("turnip,ir3/a750: Implement consts loading via preamble")

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27829>
1 file changed