[Bug 739844] 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

--- Comment #1 from Hyunjun <zzoon.ko at samsung.com> 2014-11-09 14:40:28 UTC ---
Created an attachment (id=290272)
 View: https://bugzilla.gnome.org/attachment.cgi?id=290272
 Review: https://bugzilla.gnome.org/review?bug=739844&attachment=290272

Use snprintf instead of sprintf which is vulnerable

I replaced them to using snprintf.

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