drm/panfrost: Fix missing unlock on error in panfrost_mmu_map_fault_addr()
Add the missing unlock before return from function panfrost_mmu_map_fault_addr() in the error handling case. Fixes: 187d2929 ("drm/panfrost: Add support for GPU heap allocations") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190814044814.102294-1-weiyongjun1@huawei.com
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