[Bug 750965] rtpjitterbuffer : 1. Fix a typing error of comment. 2. Add null check in free_item function.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750965

--- Comment #3 from Sangkyu Park <sk1122.park at samsung.com> ---
I got this bug using prevent tool(coverity) as following.
in master branch 
gstrtpjitterbuffer.c
2289 line :
      item = rtp_jitter_buffer_pop (priv->jbuf, NULL);
      free_item (item);

If the item is null, it will happen crash(also follow code : item->data).
I think 'free_item' function will be safety more for later because we have to
check NULL before using the function. It is just my opinion.:)

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