drm/amdgpu: fix before and after mapping judgement for replace mapping
If the before mapping is 1 page size, so its start and last will be same. Thus below condition will become false, then to free the before mapping. > if (before->it.start != before->it.last) But in this case, we need the before mapping of 1 page size. So does after mapping. Signed-off-by: NJunwei Zhang <Jerry.Zhang@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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