x86/pv: remove unlikely() from BUG_ON() condition in pv_map_ldt_shadow_page()

BUG_ON() itself already contains an unlikely() wrapping the bug condition.

No functional change.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/pv/mm.c

@@ -55,7 +55,7 @@ bool pv_map_ldt_shadow_page(unsigned int offset)
     l1_pgentry_t gl1e, *pl1e;
     unsigned long linear = curr->arch.pv.ldt_base + offset;
 
-    BUG_ON(unlikely(in_irq()));
+    BUG_ON(in_irq());
 
     /*
      * Prior limit checking should guarantee this property.  NB. This is