[patch] drm/nv50/pm: signedness bug in nv50_pm_clocks_pre()

[Dan Carpenter]

calc_mclk() returns zero on success and negative on failure but clk is
a u32.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_pm.c b/drivers/gpu/drm/nouveau/nv50_pm.c
index 0393721..3508de9 100644
--- a/drivers/gpu/drm/nouveau/nv50_pm.c
+++ b/drivers/gpu/drm/nouveau/nv50_pm.c
@@ -540,7 +540,7 @@ nv50_pm_clocks_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 	info->mclk_hwsq.len = 0;
 	if (perflvl->memory) {
 		clk = calc_mclk(dev, perflvl->memory, &info->mclk_hwsq);
-		if (clk < 0) {
+		if ((int)clk < 0) {
 			ret = clk;
 			goto error;
 		}