usb-storage: Remove redundant assignments

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.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>