x86: use matching CFI_ENDPROC

The RING0_INT_FRAME macro defines a CFI_STARTPROC.
So we should really be using CFI_ENDPROC after it.
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/entry_32.S

@@ -1024,6 +1024,7 @@ ENTRY(xen_sysenter_target)
 	RING0_INT_FRAME
 	addl $5*4, %esp		/* remove xen-provided frame */
 	jmp sysenter_past_esp
+	CFI_ENDPROC
 
 ENTRY(xen_hypervisor_callback)
 	CFI_STARTPROC