BUG: Coverity 1081009: Missing break in switch in GiftiMeshIO

Change-Id: Iba5e0f028d7c1f28056e0a9be8c22a6aa66146fe
Merge topic 'cov_1081009'

3b13d36b BUG: Coverity 1081009: Missing break in switch in GiftiMeshIO