Fix the number of bytes calculated when reading empty structure arrays with fields
Fix the number of bytes calculated when reading empty structure arrays
with fields

* src/mat5.c (ReadNextStructField): If nmemb is 0, do not use it to
     calculate the number of bytes for the data

CBL-ORION/matio,NJannasch/matio,tbeu/matio,MaartenBent/matio,MaartenBent/matio,tbeu/matio,martinichka/matio-coder,tbeu/matio,tbeu/matio,CBL-ORION/matio-sf-mirror,CBL-ORION/matio,MaartenBent/matio,telehan/libmatio,martinichka/matio-coder,martinichka/matio-coder,NJannasch/matio,MaartenBent/matio,CBL-ORION/matio-sf-mirror,telehan/libmatio