Fix NULL pointer access
Fix NULL pointer access

* tools/matdump.c (print_default_numeric_2d): Check that matvar->data is not
      NULL

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