drm/amdgpu: Fix uninitialized variable warnings

return 0 to avoid returning an uninitialized variable r
Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -97,7 +97,7 @@ static int aldebaran_mode2_suspend_ip(struct amdgpu_device *adev)
 		adev->ip_blocks[i].status.hw = false;
 	}
 
-	return r;
+	return 0;
 }
 
 static int

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

@@ -92,7 +92,7 @@ static int sienna_cichlid_mode2_suspend_ip(struct amdgpu_device *adev)
 		adev->ip_blocks[i].status.hw = false;
 	}
 
-	return r;
+	return 0;
 }
 
 static int