hwc2: Close acquire fence fd of vds output buffer

Bug: 29945684
Change-Id: Ic7ff485aab2d61f9c0b885f8091f5f1ee5ecdd9b
diff --git a/msm8996/sdm/libs/hwc2/hwc_display_virtual.cpp b/msm8996/sdm/libs/hwc2/hwc_display_virtual.cpp
index 8c16e5c..32ec36a 100644
--- a/msm8996/sdm/libs/hwc2/hwc_display_virtual.cpp
+++ b/msm8996/sdm/libs/hwc2/hwc_display_virtual.cpp
@@ -158,6 +158,7 @@
     }
   }
   CloseAcquireFds();
+  close(output_buffer_->acquire_fence_fd);
   return status;
 }