usb-storage: Remove redundant assignments

The assignments in these two places will be overwritten, so they
should be deleted.

The clang_analyzer complains as follows:

drivers/usb/storage/sierra_ms.c:

Value stored to 'retries' is never read
Value stored to 'result' is never read
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: luo penghao <luo.penghao@zte.com.cn>
Link: https://lore.kernel.org/r/20211230063819.586428-1-luo.penghao@zte.com.cnSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/storage/sierra_ms.c

@@ -130,8 +130,6 @@ int sierra_ms_init(struct us_data *us)
 	struct swoc_info *swocInfo;
 	struct usb_device *udev;
 
-	retries = 3;
-	result = 0;
 	udev = us->pusb_dev;
 
 	/* Force Modem mode */