KVM: s390: Remove ptep_zap_softleaf_entry()

KVM: s390: Remove ptep_zap_softleaf_entry()

Migration entries do not need to be removed.

The swap subsystem has been (and still is being) heavily reworked. The
current implementation of ptep_zap_softleaf_entry() has been slowly
modified and is now wrong, since it unconditionally calls
swap_put_entries_direct() for both swap and migration entries.

Remove ptep_zap_softleaf_entry() altogether, merge the path for proper
swap entries directly in the only caller, and ignore migration entries.

Fixes: 200197908dc4 ("KVM: s390: Refactor and split some gmap helpers")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260602142356.169458-11-imbrenda@linux.ibm.com>