drm/msm: Fix wrong pointer check in a5xx_destroy

Instead of checking for a5xx_gpu->gpmu_iova during destroy we
accidently check a5xx_gpu->gpmu_bo.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

-/* Copyright (c) 2016 The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2017 The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -534,7 +534,7 @@ static void a5xx_destroy(struct msm_gpu *gpu)
 	}
 
 	if (a5xx_gpu->gpmu_bo) {
-		if (a5xx_gpu->gpmu_bo)
+		if (a5xx_gpu->gpmu_iova)
 			msm_gem_put_iova(a5xx_gpu->gpmu_bo, gpu->id);
 		drm_gem_object_unreference_unlocked(a5xx_gpu->gpmu_bo);
 	}