KVM: PPC: Book3S HV: Release lock on page-out failure path

KVM: PPC: Book3S HV: Release lock on page-out failure path

[ Upstream commit e032e3b55b6f487e48c163c5dca74086f147a169 ]

When migrate_vma_setup() fails in kvmppc_svm_page_out(),
release kvm->arch.uvmem_lock before returning.

Fixes: ca9f4942670 ("KVM: PPC: Book3S HV: Support for running secure guests")
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>