Fix memory leak in Mat_H5ReadDatasetInfo
Fix memory leak in Mat_H5ReadDatasetInfo

In Mat_H5ReadNextReferenceInfo and Mat_VarReadNextInfo73 it's already correct.

MaartenBent/matio,MaartenBent/matio,tbeu/matio,tbeu/matio,tbeu/matio,NJannasch/matio,MaartenBent/matio,tbeu/matio,NJannasch/matio,MaartenBent/matio