drivers/usb/musb/musb_udc.c: Fix spelling of "mismatch".

drivers/usb/musb/musb_udc.c

@@ -269,7 +269,7 @@ static void musb_peri_ep0_set_address(void)
 				      __PRETTY_FUNCTION__, udc_device->address);
 	} else {
 		if (debug_level > 0)
-			serial_printf("ERROR : %s Address missmatch "
+			serial_printf("ERROR : %s Address mismatch "
 				      "sw %d vs hw %d\n",
 				      __PRETTY_FUNCTION__,
 				      udc_device->address, faddr);