drm/amdgpu: remove redundant initialization of variable ret

The variable ret is being initialized with a value that is never read
and it is being updated later with a new value.  The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

@@ -1669,7 +1669,7 @@ static ssize_t amdgpu_set_pp_power_profile_mode(struct device *dev,
 		const char *buf,
 		size_t count)
 {
-	int ret = 0xff;
+	int ret;
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = ddev->dev_private;
 	uint32_t parameter_size = 0;