[GRASS-git] [OSGeo/grass] ed8195: display/d.linegraph: fix generate graph image if '...

[Tomas Zigo]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: ed8195d493dbaa15e5acfdf8e55378fa71da1332
      https://github.com/OSGeo/grass/commit/ed8195d493dbaa15e5acfdf8e55378fa71da1332
  Author: Tomas Zigo <50632337+tmszi at users.noreply.github.com>
  Date:   2021-11-24 (Wed, 24 Nov 2021)

  Changed paths:
    M display/d.linegraph/main.c

  Log Message:
  -----------
  display/d.linegraph: fix generate graph image if 'x_title', 'y_title' param arg isn't defined (#1978)

* fix dynamic memory allocation if 'x_title', 'y_title' param arg isn't defined