drm/amdkfd: Fix memory leakage

drm/amdkfd: Fix memory leakage

[ Upstream commit ba861b015f67a7f3ba7fb31608727ceb926a7b14 ]

This patch fixes potential memory leakage and seg fault
in  _gpuvm_import_dmabuf() function

Fixes: 6abc52980c99 ("drm/amdkfd: Allow access for mmapping KFD BOs")
Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>