x86/hypercall: address violations of MISRA C Rule 16.3

Address violations of MISRA C:2012 Rule 16.3:
"An unconditional `break' statement shall terminate every
switch-clause".

No functional change.

Signed-off-by: Federico Serafini <federico.serafini@bugseng.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/include/asm/hypercall.h

@@ -55,7 +55,7 @@ static inline void clobber_regs64(struct cpu_user_regs *regs,
     case 4: regs->r10 = 0xdeadbeefdeadf00dUL; fallthrough;
     case 3: regs->rdx = 0xdeadbeefdeadf00dUL; fallthrough;
     case 2: regs->rsi = 0xdeadbeefdeadf00dUL; fallthrough;
-    case 1: regs->rdi = 0xdeadbeefdeadf00dUL;
+    case 1: regs->rdi = 0xdeadbeefdeadf00dUL; break;
     }
 #endif
 }
@@ -71,7 +71,7 @@ static inline void clobber_regs32(struct cpu_user_regs *regs,
     case 4: regs->esi = 0xdeadf00dU; fallthrough;
     case 3: regs->edx = 0xdeadf00dU; fallthrough;
     case 2: regs->ecx = 0xdeadf00dU; fallthrough;
-    case 1: regs->ebx = 0xdeadf00dU;
+    case 1: regs->ebx = 0xdeadf00dU; break;
     }
 #endif
 }