After investigating, we do dispose of the TLS connections
appropriately in the souphttpsrc test, which in turn
calls gnutls_deinit, but certificates get leaked anyway.
Original commit message from CVS:
* ext/jpeg/gstsmokeenc.c: (gst_smokeenc_chain):
* tests/check/Makefile.am:
* tests/check/gst-plugins-good.supp:
Add a few libjpeg suppressions and initialize a variable to
make smokeenc valgrind clean. Fixes bug #515701.