Add missing break statement to address a violation of MISRA C Rule 16.3.

No functional change.

Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
---
 xen/arch/x86/domctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 9190e11faa..68b5b46d1a 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -517,6 +517,7 @@ long arch_do_domctl(
 
         default:
             ret = -ENOSYS;
+            break;
         }
         break;
     }
-- 
2.34.1