gralloc1: Work around handle delete by hidl wrapper

This works around bug 36355756. Initializing the fds in the
handle to -1 before deleting is probably good practice anyway.
The handle delete needs to move to gralloc1 FreeBuffer() but
currently the client does it.

CRs-Fixed: 2022058
Change-Id: I4ae51e4cd90adb709287a01d66138df51924af8c
2 files changed