drm/amd/pm: delete dead code

"ret" was checked earlier inside the loop, so we know it is zero here.
No need to check a second time.

Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c

@@ -2341,9 +2341,6 @@ static int mca_get_mca_entry(struct amdgpu_device *adev, enum amdgpu_mca_error_t
 			return ret;
 	}
 
-	if (ret)
-		return ret;
-
 	entry->idx = idx;
 	entry->type = type;