[PATCH v2] drm/msm/dpu: clean up dpu_kms_get_clk_rate() returns

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Static analysis tools complain about the -EINVAL error code being
stored in an unsigned variable.  Let's change this to match
the clk_get_rate() function which is type unsigned long and returns
zero on error.

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
v2: In v1 I change the type to int which was wrong.  This is a different
    approach.  CC the freedreno list this time too.

 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 4 ++--
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 0e7a68714e9e..25e6a15eaf9f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -979,13 +979,13 @@ static int _dpu_kms_mmu_init(struct dpu_kms *dpu_kms)
 	return 0;
 }
 
-u64 dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name)
+unsigned long dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name)
 {
 	struct clk *clk;
 
 	clk = msm_clk_bulk_get_clock(dpu_kms->clocks, dpu_kms->num_clocks, clock_name);
 	if (!clk)
-		return -EINVAL;
+		return 0;
 
 	return clk_get_rate(clk);
 }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index aca39a4689f4..961918e5a5b3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -201,6 +201,6 @@ void dpu_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc);
  *
  * Return: current clock rate
  */
-u64 dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name);
+unsigned long dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name);
 
 #endif /* __dpu_kms_H__ */
-- 
2.39.2