drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl

Drop reference to syncobj and timeline fence when aborting the ioctl due
output array being too small.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Fixes: a292fde ("drm/amdgpu: Implement userqueue signal/wait IOCTL")
Cc: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 68951e9)
Cc: <stable@vger.kernel.org> # v6.16+

Author: Tvrtko Ursulin

drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c

@@ -876,6 +876,7 @@ int amdgpu_userq_wait_ioctl(struct drm_device *dev, void *data,
 				dma_fence_unwrap_for_each(f, &iter, fence) {
 					if (WARN_ON_ONCE(num_fences >= wait_info->num_fences)) {
 						r = -EINVAL;
+						dma_fence_put(fence);
 						goto free_fences;
 					}
 
@@ -900,6 +901,7 @@ int amdgpu_userq_wait_ioctl(struct drm_device *dev, void *data,
 
 			if (WARN_ON_ONCE(num_fences >= wait_info->num_fences)) {
 				r = -EINVAL;
+				dma_fence_put(fence);
 				goto free_fences;
 			}