powerpc/vmemmap: Reshuffle vmemmap_free()

Removes an indentation level and shuffles some code around to make the
following patch cleaner. No functional changes.

Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>