msm: kgsl: Do not release dma and anon buffers if unmap fails

If iommu unmap fails and leaves dma or anon buffers still mapped in the
iommu, do not free them.

Change-Id: Ice0e1a59c1ac0ee7a9d62d8899966b84fa63d5ca
Signed-off-by: Lynus Vaz <quic_lvaz@quicinc.com>
(cherry picked from commit 8d3d730f6a9be5341f4001297323394be3240b75)