x86/paging: remove pointless current domain checks

Checking that the subject domain is not the current one is pointless
when already having paused that domain: domain_pause() already
ASSERT()s this to be the case.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -464,13 +464,6 @@ int hap_enable(struct domain *d, u32 mod
 
     domain_pause(d);
 
-    /* error check */
-    if ( (d == current->domain) )
-    {
-        rv = -EINVAL;
-        goto out;
-    }
-
     old_pages = d->arch.paging.hap.total_pages;
     if ( old_pages == 0 )
     {
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -2972,8 +2972,7 @@ int shadow_enable(struct domain *d, u32 
     domain_pause(d);
 
     /* Sanity check the arguments */
-    if ( (d == current->domain) ||
-         shadow_mode_enabled(d) ||
+    if ( shadow_mode_enabled(d) ||
          ((mode & PG_translate) && !(mode & PG_refcounts)) ||
          ((mode & PG_external) && !(mode & PG_translate)) )
     {