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

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

Signed-off-by: Tvrtko Ursulin <[email protected]>
Fixes: 245a4a7 ("dma-buf: generalize dma_fence unwrap & merging v3")
Cc: Christian König <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Cc: Friedrich Vock <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: <[email protected]> # v6.0+
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Christian König <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Tvrtko Ursulin

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

@@ -164,6 +164,8 @@ 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;
 	}