[PATCH] powerpc: fix unbalanced node refcount in check_kvm_guest()

[Tyrel Datwyler]

On 9/28/21 5:45 AM, Nathan Lynch wrote:
> When check_kvm_guest() succeeds in looking up a /hypervisor OF node, it
> returns without performing a matching put for the lookup, leaving the
> node's reference count elevated.
> 
> Add the necessary call to of_node_put(), rearranging the code slightly to
> avoid repetition or goto.
> 
> Signed-off-by: Nathan Lynch <nathanl at linux.ibm.com>
> Fixes: 107c55005fbd ("powerpc/pseries: Add KVM guest doorbell restrictions")

Reviewed-by: Tyrel Datwyler <tyreld at linux.ibm.com>