x86/pv-shim: correctly ignore empty onlining requests

x86/pv-shim: correctly ignore empty onlining requests

Mem-op requests may have zero extents. Such requests need treating as
no-ops. pv_shim_online_memory(), however, would have tried to take 2³²-1
order-sized pages from its balloon list (to then populate them),
typically ending when the entire set of ballooned pages of this order
was consumed.

Note that pv_shim_offline_memory() does not have such an issue.

Fixes: b2245acc60c3 ("xen/pvshim: memory hotplug")
Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 9272225ca72801fd9fa5b268a2d1c5adebd19cd9
master date: 2022-10-28 15:47:59 +0200