r600/sfn: Don't fall through if a WaitACK was scheduled

In theory this is of no consequence, but letting the scheduler run
it's normal algorithm is better.

Fixes: a6b6ce84f7 ("r600/sfn: Prepare scheduler to handle WaitAck instructions")

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37232>

src/gallium/drivers/r600/sfn/sfn_scheduler.cpp

@@ -365,6 +365,7 @@ BlockScheduler::schedule_block(Block& in_block,
             current_shed = sched_alu;
             break;
          }
+         break;
       case sched_alu:
          if (!schedule_alu(out_blocks, vf)) {
             assert(!m_current_block->lds_group_active());