Revert "usb: dwc3: gadget: skip Set/Clear Halt when invalid"

This reverts commit ffb80fc6

.

Turns out that commit is wrong. Host controllers are allowed to use
Clear Feature HALT as means to sync data toggle between host and
periperal.

Cc: <stable@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/gadget.c

@@ -1470,9 +1470,6 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
 		unsigned transfer_in_flight;
 		unsigned started;
 
-		if (dep->flags & DWC3_EP_STALL)
-			return 0;
-
 		if (dep->number > 1)
 			trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
 		else
@@ -1494,8 +1491,6 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
 		else
 			dep->flags |= DWC3_EP_STALL;
 	} else {
-		if (!(dep->flags & DWC3_EP_STALL))
-			return 0;
 
 		ret = dwc3_send_clear_stall_ep_cmd(dep);
 		if (ret)