The following error was reported when runing usrsocktest with KASAN check enabled.
==1348590==ERROR: AddressSanitizer: stack-buffer-overflow on address 0xf20ec610 at pc 0x56ac61ba bp 0xf20ec278 sp 0xf20ec268
rootcause:
hdrbuf's size is not large enough to store the data in usrsock's request.
solution:
double herbuf's size to make sure the space, used to store usrsock's request, is enough.
Signed-off-by: liangchaozhong <liangchaozhong@xiaomi.com>