dma-buf: actually set signaling bit for private stub fences

dma-buf: actually set signaling bit for private stub fences

commit f6e519ea51d275720db33722510d582fedc5c373 upstream.

In dma_fence_allocate_private_stub() set the signaling bit of the newly
allocated private stub fence rather than the signaling bit of the
shared dma_fence_stub.

Cc: <stable@vger.kernel.org> # v6.1
Fixes: a8f822356eb9 ("dma-buf: set signaling bit for the stub fence")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230126002844.339593-1-dakr@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>