Fix uninitialized argument when deleting a variable
Fix uninitialized argument when deleting a variable

* src/mat.c (Mat_VarDelete): Initialize mat_file_ver to MAT_FT_DEFAULT

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