KVM: s390: vsie: Fix race in acquire_gmap_shadow()

KVM: s390: vsie: Fix race in acquire_gmap_shadow()

The shadow gmap returned by gmap_create_shadow() could get dropped
before taking the gmap->children_lock. This meant that the shadow gmap
was sometimes being used while its reference count was 0.

Fix this by taking the additional reference inside gmap_create_shadow()
while still holding gmap->children_lock, instead of afterwards.

Fixes: e38c884df921 ("KVM: s390: Switch to new gmap")
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>