x86, vmi: TSC going backwards check in vmi clocksource, cleanup

clean up vmi_read_cycles to use max()

Reported-b: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAlok N Kataria <akataria@vmware.com>
Cc: Zach Amsden <zach@vmware.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/vmiclock_32.c

@@ -288,8 +288,7 @@ static struct clocksource clocksource_vmi;
 static cycle_t read_real_cycles(void)
 {
 	cycle_t ret = (cycle_t)vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
-	return ret >= clocksource_vmi.cycle_last ?
-		ret : clocksource_vmi.cycle_last;
+	return max(ret, clocksource_vmi.cycle_last);
 }
 
 static struct clocksource clocksource_vmi = {