[patch] drm: rockchip: signedness bug in dw_mipi_dsi_get_lane_bps()

[Dan Carpenter]

"bpp" needs to be signed for the error handling to work.

Fixes: 84e05408fcfe ('drm: rockchip: Support Synopsys DW MIPI DSI')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c 
b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7bfe243..c35e5af 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -461,7 +461,8 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)

 static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
 {
-       unsigned int bpp, i, pre;
+       int bpp;
+       unsigned int i, pre;
        unsigned long mpclk, pllref, tmp;
        unsigned int m = 1, n = 1, target_mbps = 1000;
        unsigned int max_mbps = dptdin_map[ARRAY_SIZE(dptdin_map) - 1].max_mbps;