[Bug 758161] New: qtdemux: Fix string memory leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758161

            Bug ID: 758161
           Summary: qtdemux: Fix string memory leak
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vineeth.tm at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The string got using g_strdup_printf will be allocated memory and should be
freed after use.

Fixes the below memory leak

==2692== 24 bytes in 1 blocks are definitely lost in loss record 8,801 of
18,861
==2692==    at 0x402C17C: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==2692==    by 0x4B9F2AF: __vasprintf_chk (vasprintf_chk.c:80)
==2692==    by 0x4A07689: g_vasprintf (in
/lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==2692==    by 0x49E0FF2: g_strdup_vprintf (in
/lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==2692==    by 0x49E1022: g_strdup_printf (in
/lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==2692==    by 0xF4CE647: qtdemux_parse_tree (qtdemux.c:12763)
==2692==    by 0xF4D76B8: gst_qtdemux_loop_state_header (qtdemux.c:3866)
==2692==    by 0xF4DBAB0: gst_qtdemux_loop (qtdemux.c:5268)
==2692==    by 0x414DBD8: gst_task_func (gsttask.c:331)
==2692==    by 0x414ED7E: default_func (gsttaskpool.c:68)
==2692==    by 0x49EA404: ??? (in /lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==2692==    by 0x49E99A9: ??? (in /lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)

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