KVM: PPC: Book3S HV: Delete an error message for a failed memory allocation in kvmppc_allocate_hpt()

Omit an extra message for a memory allocation failure in this function.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>