radeonsi: check ctx->sdma_cs before using it
e5167a92 disabled SDMA for gfx8. This caused 3 piglit arb_sparse_buffer tests (basic, buffer-data and commit) to crash on GFX8.
Reported-by: Michel Dänzer michel@daenzer.net
e5167a92 disabled SDMA for gfx8. This caused 3 piglit arb_sparse_buffer tests (basic, buffer-data and commit) to crash on GFX8.
Reported-by: Michel Dänzer michel@daenzer.net