ac/surface: fix MSAA crash with FORCE_SWIZZLE_MODE on gfx9
Fixes: 3dc2ccc1 "ac/surface: replace RADEON_SURF_OPTIMIZE_FOR_SPACE with !FORCE_SWIZZLE_MODE"
Closes: #2884 (closed)
Fixes: 3dc2ccc1 "ac/surface: replace RADEON_SURF_OPTIMIZE_FOR_SPACE with !FORCE_SWIZZLE_MODE"
Closes: #2884 (closed)