RADIUS: Remove unused write

There is no need to update the left variable when breaking out from the
loop.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/radius/radius.c

@@ -945,7 +945,6 @@ static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
 			vhdr = (struct radius_attr_vendor *) pos;
 			if (vhdr->vendor_length > left ||
 			    vhdr->vendor_length < sizeof(*vhdr)) {
-				left = 0;
 				break;
 			}
 			if (vhdr->vendor_type != subtype) {