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

 drivers/gpu/drm/mediatek/mtk_drm_drv.c:316:24: warning: no previous prototype 
for ‘mtk_drm_gem_prime_import’ [-Wmissing-prototypes]

Cc: Chun-Kuang Hu <chunkuang...@kernel.org>
Cc: Philipp Zabel <p.za...@pengutronix.de>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Matthias Brugger <matthias....@gmail.com>
Cc: Sumit Semwal <sumit.sem...@linaro.org>
Cc: "Christian König" <christian.koe...@amd.com>
Cc: YT SHEN <yt.s...@mediatek.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux-media...@lists.infradead.org
Cc: linux-me...@vger.kernel.org
Cc: linaro-mm-...@lists.linaro.org
Signed-off-by: Lee Jones <lee.jo...@linaro.org>
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c 
b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 2e8065b1e2bbc..401311453e7d0 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -313,8 +313,8 @@ static const struct file_operations mtk_drm_fops = {
  * We need to override this because the device used to import the memory is
  * not dev->dev, as drm_gem_prime_import() expects.
  */
-struct drm_gem_object *mtk_drm_gem_prime_import(struct drm_device *dev,
-                                               struct dma_buf *dma_buf)
+static struct drm_gem_object *mtk_drm_gem_prime_import(struct drm_device *dev,
+                                                      struct dma_buf *dma_buf)
 {
        struct mtk_drm_private *private = dev->dev_private;
 
-- 
2.25.1

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