x86/HVM: re-order error path of hvm_domain_initialise()

hvm_destroy_all_ioreq_servers(), called from
hvm_domain_relinquish_resources(), invokes relocate_portio_handler(),
which uses d->arch.hvm.io_handler. Defer freeing of this array
accordingly on the error path of hvm_domain_initialise().

Similarly rtc_deinit() requires d->arch.hvm.pl_time to still be around,
or else an armed timer structure would get freed, and that timer never
get killed.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: fbb3bf002b
master date: 2021-01-29 11:36:54 +0100

xen/arch/x86/hvm/hvm.c

@@ -702,15 +702,15 @@ int hvm_domain_initialise(struct domain *d)
  fail1:
     if ( is_hardware_domain(d) )
         xfree(d->arch.hvm.io_bitmap);
-    XFREE(d->arch.hvm.io_handler);
     XFREE(d->arch.hvm.params);
-    XFREE(d->arch.hvm.pl_time);
     XFREE(d->arch.hvm.irq);
  fail0:
     hvm_destroy_cacheattr_region_list(d);
     destroy_perdomain_mapping(d, PERDOMAIN_VIRT_START, 0);
  fail:
     hvm_domain_relinquish_resources(d);
+    XFREE(d->arch.hvm.io_handler);
+    XFREE(d->arch.hvm.pl_time);
     return rc;
 }