usb: dwc3: gadget: cmd argument should always be unsigned

No functional changes, just making sure we're dealing
with unsigned ints.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.h

@@ -938,7 +938,7 @@ int dwc3_gadget_get_link_state(struct dwc3 *dwc);
 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state);
 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 		unsigned cmd, struct dwc3_gadget_ep_cmd_params *params);
-int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param);
+int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param);
 #else
 static inline int dwc3_gadget_init(struct dwc3 *dwc)
 { return 0; }

drivers/usb/dwc3/gadget.c

@@ -273,7 +273,7 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 	spin_lock(&dwc->lock);
 }
 
-int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
+int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 {
 	u32		timeout = 500;
 	u32		reg;