pvecm: qdevice setup: fix check for odd node count

pvecm: qdevice setup: fix check for odd node count

With Perl 5.26 the behavior of `scalar(%hash)` changed [0] causing the
check for odd numbers to never evaluate to true. Allowing odd sized
clusters to set up a QDevice. The algorithm was not changed to LMS if
forced to still create the QDevice.

Instead of showing the bucket info of the referenced hash it did show
the hash reference. Dereferencing it will again return the number of
items present in the hash.

[0] https://perldoc.perl.org/perl5260delta.html#scalar(%25hash)-return-signature-changed

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>