usb: ehci: fix comment for EHCI_SHRINK_JIFFIES

EHCI_SHRINK_JIFFIES should be 5ms, which was just used originally,
and not 200ms, so fix it.
Signed-off-by: NMing Lei <tom.leiming@gmail.com>
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hcd.c

@@ -95,7 +95,7 @@ static const char	hcd_name [] = "ehci_hcd";
 #define EHCI_IO_JIFFIES		(HZ/10)		/* io watchdog > irq_thresh */
 #define EHCI_ASYNC_JIFFIES	(HZ/20)		/* async idle timeout */
 #define EHCI_SHRINK_JIFFIES	(DIV_ROUND_UP(HZ, 200) + 1)
-						/* 200-ms async qh unlink delay */
+						/* 5-ms async qh unlink delay */
 
 /* Initial IRQ latency:  faster than hw default */
 static int log2_irq_thresh = 0;		// 0 to 6