Add pseudo keyword fallthrough to meet the requirements to deviate
a violation of MISRA C Rule 16.3 ("An unconditional `break'
statement shall terminate every switch-clause").

No functional change.

Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
---
 xen/arch/x86/hvm/vpt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/hvm/vpt.c b/xen/arch/x86/hvm/vpt.c
index e1d6845a28..c76a9a272b 100644
--- a/xen/arch/x86/hvm/vpt.c
+++ b/xen/arch/x86/hvm/vpt.c
@@ -121,6 +121,8 @@ static int pt_irq_masked(struct periodic_time *pt)
     }
 
     /* Fallthrough to check if the interrupt is masked on the IO APIC. */
+    fallthrough;
+
     case PTSRC_ioapic:
     {
         int mask = vioapic_get_mask(v->domain, gsi);
-- 
2.34.1