usb: gadget: remove useless parameter in alloc_ep_req()

The default_length parameter of alloc_ep_req was not really necessary
and gadget drivers would almost always create an inline function to pass
the same value to len and default_len.

This patch removes that parameter and updates all calls to alloc_ep_req() to
use the new API.

Signed-off-by: Felipe F. Tonello <eu@felipetonello.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
diff --git a/drivers/usb/gadget/u_f.c b/drivers/usb/gadget/u_f.c
index 907f814..1883973 100644
--- a/drivers/usb/gadget/u_f.c
+++ b/drivers/usb/gadget/u_f.c
@@ -14,15 +14,14 @@
 #include "u_f.h"
 #include <linux/usb/ch9.h>
 
-struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len)
+struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len)
 {
 	struct usb_request      *req;
 
 	req = usb_ep_alloc_request(ep, GFP_ATOMIC);
 	if (req) {
-		req->length = len ?: default_len;
-		if (usb_endpoint_dir_out(ep->desc))
-			req->length = usb_ep_align(ep, req->length);
+		req->length = usb_endpoint_dir_out(ep->desc) ?
+			usb_ep_align(ep, len) : len;
 		req->buf = kmalloc(req->length, GFP_ATOMIC);
 		if (!req->buf) {
 			usb_ep_free_request(ep, req);