x86/hap: Fix memory leak of domain->arch.hvm_domain.dirty_vram

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
Signed-off-by: Tim Deegan <tim@xxxxxxx>

diff -r d89986111f0c xen/arch/x86/mm/hap/hap.c
--- a/xen/arch/x86/mm/hap/hap.c	Tue Nov 27 13:28:36 2012 +0100
+++ b/xen/arch/x86/mm/hap/hap.c	Thu Nov 29 15:22:33 2012 +0000
@@ -686,6 +686,9 @@ void hap_teardown(struct domain *d)
 
     d->arch.paging.mode &= ~PG_log_dirty;
 
+    xfree(d->arch.hvm_domain.dirty_vram);
+    d->arch.hvm_domain.dirty_vram = NULL;
+
     hap_unlock(d);
 }