Re: "KMSAN: uninit-value in rt2500usb_bbp_read" and "KMSAN: uninit-value in rt2500usb_probe_hw" should be duplicate crash reports

## Patch

I propose to memset reg variable before invoking
rt2x00usb_vendor_req_buff_lock/rt2x00usb_vendor_request_buff.

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diff --git a/drivers/net/wireless/ralink/rt2x00/rt2500usb.c

b/drivers/net/wireless/ralink/rt2x00/rt2500usb.c
index fce05fc88aaf..f6c93a25b18c 100644

--- a/drivers/net/wireless/ralink/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2500usb.c

@@ -48,6 +48,7 @@ static u16 rt2500usb_register_read(struct rt2x00_dev

*rt2x00dev,
                                   const unsigned int offset)
 {
        __le16 reg;
+       memset(&reg, 0, sizeof(reg));