gst_init exceptions when it is used in a dynamic lib which is loaded by dlopen

[Halley Zhao]

Hi experts:
I created a dynamic lib to use gst, and the lib is loaded by dlopen.
then there is exception to load the lib for a second playback.

1. if I call gst_deinit() before dlclose the lib. I fail to create any gst
element next time after calling gst_init() again.  gst_init_check() said
gst has already been inited.

0:00:08.140795000  5131 0xffff98003e90 DEBUG               GST_INIT
gst.c:417:gst_init_check: already initialized gst
0:00:08.140939875  5131 0xffff98003e90 WARN     GST_ELEMENT_FACTORY
gstelementfactory.c:456:gst_element_factory_make: no such element factory
"appsrc"!

2. if I skip call gst_deinit() before dlclose the lib, some exception comes
for g_type_check
(gdb) bt
#0  0x0000ffffbeb67dd8 in strcmp () from /usr/lib64/libc.so.6
#1  0x0000ffffbf16ba5c in g_str_equal () from /usr/lib64/libglib-2.0.so
#2  0x0000ffffbf16af08 in g_hash_table_lookup ()
   from /usr/lib64/libglib-2.0.so
#3  0x0000ffffbf18d648 in g_intern_static_string ()
   from /usr/lib64/libglib-2.0.so
#4  0x0000ffffb70548dc in gst_audio_clock_get_type ()
   from /usr/lib64/libgstaudio-1.0.so.0
#5  0x0000ffffb705494c in gst_audio_clock_new ()
   from /usr/lib64/libgstaudio-1.0.so.0
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