[Bug 758517] New: spu-pgs: Fix array memory leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758517

            Bug ID: 758517
           Summary: spu-pgs: Fix array memory leak
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vineeth.tm at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When flushing the dvdspu, the even though presentation segment is set as 0,
using pgs_presentation_segment_set_object_count, the array is still being
created resulting in the below memory leak
Adding an extra condition to check if n_objects is != 0 then create the
presentation objects

==11169== 40 bytes in 1 blocks are definitely lost in loss record 4,311 of
6,591
==11169==    at 0x4C2AB80: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11169==    by 0x5D29610: g_malloc (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.4002.0)
==11169==    by 0x5D3F22D: g_slice_alloc (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.4002.0)
==11169==    by 0x5CF8C44: g_array_sized_new (in
/lib/x86_64-linux-gnu/libglib-2.0.so.0.4002.0)
==11169==    by 0x20F43D8B: pgs_presentation_segment_set_object_count.isra.5
(gstspu-pgs.c:322)
==11169==    by 0x20F44A11: gstspu_pgs_flush (gstspu-pgs.c:799)
==11169==    by 0x20F3EBE8: gst_dvd_spu_flush_spu_info (gstdvdspu.c:270)
==11169==    by 0x20F3EC3A: gst_dvd_spu_clear (gstdvdspu.c:181)
==11169==    by 0x20F408C9: gst_dvd_spu_change_state (gstdvdspu.c:1229)
==11169==    by 0x57C02CC: gst_element_change_state (gstelement.c:2627)
==11169==    by 0x57C0ADB: gst_element_set_state_func (gstelement.c:2581)
==11169==    by 0x579F805: gst_bin_change_state_func (gstbin.c:2414)

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