crypt_sha1_rn: fix memory leak
crypt_sha1_rn: fix memory leak

Reported-by: Vitaly Chikunov <0d216168d6c4f83410e4fa17a56d762f8c0260fc@altlinux.org>

besser82/libxcrypt,besser82/libxcrypt,besser82/libxcrypt,besser82/libxcrypt