radv: Remove unnecessary null check.
Fix defect reported by Coverity Scan.
Dereference before null check (REVERSE_INULL) check_after_deref: Null-checking subpass suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
Fixes: 779e0963 ("radv: configure DB_Z_INFO.NUM_SAMPLES correctly on GFX11") Signed-off-by: Vinson Lee vlee@freedesktop.org