radeonsi: remove early return in si_upload_descriptors

All updates of descriptors_dirty also set dirty_mask, so the return is
unnecessary. The next commit will want this function to be executed
even if dirty_mask == 0.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/drivers/radeonsi/si_descriptors.c

@@ -197,9 +197,6 @@ static bool si_upload_descriptors(struct si_context *sctx,
 {
 	unsigned list_size = desc->num_elements * desc->element_dw_size * 4;
 
-	if (!desc->dirty_mask)
-		return true;
-
 	if (sctx->ce_ib && desc->uses_ce) {
 		uint32_t const* list = (uint32_t const*)desc->list;