memremap: don't use a separate devm action for devmap_managed_enable_get

memremap: don't use a separate devm action for devmap_managed_enable_get

Just clean up for early failures and then piggy back on
devm_memremap_pages_release.  This helps with a pending not device managed
version of devm_memremap_pages.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Ira Weiny <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Tested-by: Bharata B Rao <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>