[libata] fix broken delay

Due to rounding and HZ==100, sometimes delays would not occur for
the desired length of time, or even at all.

Fix call to schedule_timeout() to ensure we delay -at least- for
the correct amount of time.

drivers/scsi/libata-core.c

@@ -118,7 +118,7 @@ static const char *ata_thr_state_name(unsigned int thr_state)
 static void msleep(unsigned long msecs)
 {
 	set_current_state(TASK_UNINTERRUPTIBLE);
-	schedule_timeout(msecs_to_jiffies(msecs));
+	schedule_timeout(msecs_to_jiffies(msecs) + 1);
 }
 
 /**