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Otherwise we can fail to drop the software mutex when
we fail to take the hardware mutex.

Fixes: 76acba7b

 ("drm/amdgpu/gfx11: add a mutex for the gfx semaphore")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>