XENMEM_{in,de}crease_reservation as well as XENMEM_populate_physmap
return the extent at which failure was detected, not error indicators.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -747,11 +747,10 @@ long do_memory_op(unsigned long cmd, XEN
             return start_extent;
         args.domain = d;
 
-        rc = xsm_memory_adjust_reservation(XSM_TARGET, current->domain, d);
-        if ( rc )
+        if ( xsm_memory_adjust_reservation(XSM_TARGET, current->domain, d) )
         {
             rcu_unlock_domain(d);
-            return rc;
+            return start_extent;
         }
 
         switch ( op )

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