drm: zte: fix static checker warning on variable 'fmt'

Commit 4e986d3705df ("drm: zte: add overlay plane support") introduces
the following static checker warning:

 drivers/gpu/drm/zte/zx_plane.c:170 zx_vl_rsz_setup()
 warn: always true condition '(fmt >= 0) => (0-u32max >= 0)'

Fix it by change 'fmt' type to integer.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 4e986d3705df ("drm: zte: add overlay plane support")
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1487598551-28310-1-git-send-email-shawnguo@kernel.org

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/zte/zx_plane.c b/drivers/gpu/drm/zte/zx_plane.c
index 1d08ba381098..d646ac931663 100644
--- a/drivers/gpu/drm/zte/zx_plane.c
+++ b/drivers/gpu/drm/zte/zx_plane.c
@@ -159,7 +159,7 @@ static void zx_vl_rsz_setup(struct zx_plane *zplane, uint32_t format,
         void __iomem *rsz = zplane->rsz;
         u32 src_chroma_w = src_w;
         u32 src_chroma_h = src_h;
-        u32 fmt;
+        int fmt;
 
         /* Set up source and destination resolution */
         zx_writel(rsz + RSZ_SRC_CFG, RSZ_VER(src_h - 1) | RSZ_HOR(src_w - 1));
@@ -203,7 +203,7 @@ static void zx_vl_plane_atomic_update(struct drm_plane *plane,
         u32 src_x, src_y, src_w, src_h;
         u32 dst_x, dst_y, dst_w, dst_h;
         uint32_t format;
-        u32 fmt;
+        int fmt;
         int num_planes;
         int i;