Presumably we can never actually hit this return, but static checkers
complain that we should unlock before we return.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c 
b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
index 3a24788c3185..a7e55c422501 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
@@ -148,7 +148,7 @@ gk104_fifo_runlist_commit(struct gk104_fifo *fifo, int runl)
        case NVKM_MEM_TARGET_NCOH: target = 3; break;
        default:
                WARN_ON(1);
-               return;
+               goto unlock;
        }
 
        nvkm_wr32(device, 0x002270, (nvkm_memory_addr(mem) >> 12) |
@@ -160,6 +160,7 @@ gk104_fifo_runlist_commit(struct gk104_fifo *fifo, int runl)
                                       & 0x00100000),
                               msecs_to_jiffies(2000)) == 0)
                nvkm_error(subdev, "runlist %d update timeout\n", runl);
+unlock:
        mutex_unlock(&subdev->mutex);
 }
 
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