UPSTREAM: dma-fence: Fix reference leak on fence merge failure path

Release all fence references if the output dma-fence-array could not be
allocated.

Change-Id: I9d60f6f8b37e15926a40038b0278b70f4653ce51
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Fixes: 245a4a7b ("dma-buf: generalize dma_fence unwrap & merging v3")
Cc: Christian König <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Friedrich Vock <friedrich.vock@gmx.de>
Cc: linux-media@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: <stable@vger.kernel.org> # v6.0+
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241115102153.1980-2-tursulin@igalia.com


(cherry picked from commit 949291c5)
Bug: 394776841
Bug: 397845301
Signed-off-by: T.J. Mercier <tjmercier@google.com>

drivers/dma-buf/dma-fence-unwrap.c

@@ -169,6 +169,8 @@ struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
 					dma_fence_context_alloc(1),
 					1, false);
 	if (!result) {
+		for (i = 0; i < count; i++)
+			dma_fence_put(array[i]);
 		tmp = NULL;
 		goto return_tmp;
 	}