[Bug 739844] examples: use snprintf instead of sprintf which is vulnerable

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739844
  GStreamer | gst-plugins-bad | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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 Attachment #290273|none                        |rejected
             status|                            |

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