update loxigen-artifacts

* submodules/loxigen-artifacts 8ee5d1d...b44eb26 (5):
  > Artifacts from https://github.com/floodlight/loxigen/compare/65630e2e2b19efc8bb882bd57284c6ecc908d947...7e1551e20d91ac10d478843c6f4858ac60257d65
  > Artifacts from https://github.com/floodlight/loxigen/compare/f8fac1365627949e8f2bc791fc644e6db1ed73ef...65630e2e2b19efc8bb882bd57284c6ecc908d947
  > Artifacts from https://github.com/floodlight/loxigen/compare/89478fa269858287f25c2cac60ca531e52e68d51...f8fac1365627949e8f2bc791fc644e6db1ed73ef
  > Artifacts from https://github.com/floodlight/loxigen/compare/6c95181d50b2659ed3395d4847f8a0637f78c1c2...89478fa269858287f25c2cac60ca531e52e68d51
  > Artifacts from https://github.com/floodlight/loxigen/compare/006f308d68f2e21d493b96e5e7e237e85acf6e82...6c95181d50b2659ed3395d4847f8a0637f78c1c2
fix warn_unused_result
Merge into master from pull request #210:
Fix warn unused result (https://github.com/floodlight/ivs/pull/210)