drm/amd/amdgpu: Fix uninitialized variable warnings

Return 0 to avoid returning an uninitialized variable r.

Cc: stable@vger.kernel.org
Fixes: 230dd6bb ("drm/amd/amdgpu: implement mode2 reset on smu_v13_0_10")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/smu_v13_0_10.c

@@ -91,7 +91,7 @@ static int smu_v13_0_10_mode2_suspend_ip(struct amdgpu_device *adev)
 		adev->ip_blocks[i].status.hw = false;
 	}
 
-	return r;
+	return 0;
 }
 
 static int