shlist: fix shlist_prepend
shlist: fix shlist_prepend

rabbitt/libusual,ifduyue/libusual,rabbitt/libusual,ifduyue/libusual,mgjv/libusual,markokr/libusual,mgjv/libusual,markokr/libusual,rabbitt/libusual,markokr/libusual,ifduyue/libusual,markokr/libusual,ifduyue/libusual,mgjv/libusual,rabbitt/libusual,mgjv/libusual