KVM: arm64: Don't leak stage-2 page-table if VM fails to init under pKVM

KVM: arm64: Don't leak stage-2 page-table if VM fails to init under pKVM

If pkvm_init_host_vm() fails, we should free the stage-2 page-table
previously allocated by kvm_init_stage2_mmu().

Cc: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Fixes: 07aeb70707b1 ("KVM: arm64: Reserve pKVM handle during pkvm_init_host_vm()")
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://patch.msgid.link/20260330144841.26181-3-will@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>