Fixes coccicheck warning:

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c:1398:60-61:
WARNING: Unsigned expression compared with zero: j >= 0

Fixes: 238387774232 ("drm/amd/display: fix rn soc bb update")
Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Zou Wei <zou_...@huawei.com>
---
 drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index ceaf70a..419cdde 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -1384,7 +1384,8 @@ static void update_bw_bounding_box(struct dc *dc, struct 
clk_bw_params *bw_param
        struct dcn21_resource_pool *pool = TO_DCN21_RES_POOL(dc->res_pool);
        struct clk_limit_table *clk_table = &bw_params->clk_table;
        struct _vcs_dpi_voltage_scaling_st clock_limits[DC__VOLTAGE_STATES];
-       unsigned int i, j, closest_clk_lvl;
+       unsigned int i, closest_clk_lvl;
+       int j;
 
        // Default clock levels are used for diags, which may lead to 
overclocking.
        if (!IS_DIAG_DC(dc->ctx->dce_environment)) {
-- 
2.6.2

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