Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/nouveau/dispnv50/headc57d.c:173:1: warning: no previous 
prototype for ‘headc57d_olut’ [-Wmissing-prototypes]

Cc: Ben Skeggs <bske...@redhat.com>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Lyude Paul <ly...@redhat.com>
Cc: dri-de...@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jo...@linaro.org>
---
 drivers/gpu/drm/nouveau/dispnv50/headc57d.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/headc57d.c 
b/drivers/gpu/drm/nouveau/dispnv50/headc57d.c
index fd51527b56b83..bdcfd240d61c8 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/headc57d.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/headc57d.c
@@ -169,7 +169,7 @@ headc57d_olut_load(struct drm_color_lut *in, int size, void 
__iomem *mem)
        writew(readw(mem - 4), mem + 4);
 }
 
-bool
+static bool
 headc57d_olut(struct nv50_head *head, struct nv50_head_atom *asyh, int size)
 {
        if (size != 0 && size != 256 && size != 1024)
-- 
2.27.0

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