[PATCH v4 3/5] dma-buf/sync_file: add sync_file_get_fence()

From: Gustavo Padovan Creates a function that given an sync file descriptor returns a fence containing all fences in the sync_file. v2: Comments by Daniel Vetter - Adapt to new version of fence_collection_init() - Hold a reference for the fence

[PATCH v4 3/5] dma-buf/sync_file: add sync_file_get_fence()

From: Gustavo Padovan Creates a function that given an sync file descriptor returns a fence containing all fences in the sync_file. v2: Comments by Daniel Vetter - Adapt to new version of fence_collection_init() - Hold a reference for the fence we return v3: - Adapt to