usb: host: fix a typo in ehci.h

Change "ehci_hq" to "ehci_qh" in this comment.

Signed-off-by: Xu Yang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/ehci.h

···
  * acts like a qh would, if EHCI had them for ISO.
  */
 struct ehci_iso_stream {
-	/* first field matches ehci_hq, but is NULL */
+	/* first field matches ehci_qh, but is NULL */
 	struct ehci_qh_hw	*hw;
 
 	u8			bEndpointAddress;