[Bug 753701] New: discoverer: Few trivial fixes in handling error cases

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753701

            Bug ID: 753701
           Summary: discoverer: Few trivial fixes in handling error cases
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vineeth.tm at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This handles 2 fixes in discoverer

1) While using gst_discoverer_discover_uri, there are chances that info will be
returned as NULL in error cases. Passing NULL values to gst_discoverer_info***
APIs results in assertion failures like below
CRITICAL **: gst_discoverer_info_get_result: assertion
'G_TYPE_CHECK_INSTANCE_TYPE((info), (gst_discoverer_info_get_type ()))' failed


2) During error cases, for g_option_context_parse and gst_discoverer_new, err
will be allocated but not freed resulting in memory leaks.

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