[Bug 759518] yadif: Fix memory leak and mishandling.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759518

--- Comment #2 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 317462
  --> https://bugzilla.gnome.org/attachment.cgi?id=317462&action=edit
vf_yadif: Fix illegal memory access.

When testing yadif plugin, found the below memory mishandling

==12206== Conditional jump or move depends on uninitialised value(s)
==12206==    at 0x4174BA5: yadif_filter (vf_yadif.c:98)
==12206==    by 0x4174628: gst_yadif_transform (gstyadif.c:318)
==12206==    by 0x656C5B6: default_generate_output (gstbasetransform.c:2180)
==12206==    by 0x656F08C: gst_base_transform_chain (gstbasetransform.c:2333)
==12206==    by 0x40A2BA7: gst_pad_push_data (gstpad.c:4153)
==12206==    by 0x40AB866: gst_pad_push (gstpad.c:4524)
==12206==    by 0x416EB99: gst_interlace_chain (gstinterlace.c:780)
==12206==    by 0x40A2BA7: gst_pad_push_data (gstpad.c:4153)
==12206==    by 0x40AB866: gst_pad_push (gstpad.c:4524)
==12206==    by 0x65675A2: gst_base_src_loop (gstbasesrc.c:2845)
==12206==    by 0x40D9EA8: gst_task_func (gsttask.c:331)
==12206==    by 0x40DB04E: default_func (gsttaskpool.c:68)

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