ext/wavpack/gstwavpackenc.c: Fix mem leak, send newsegment event on correction pad...

ext/wavpack/gstwavpackenc.c: Fix mem leak, send newsegment event on correction pad as well (#352476).

Original commit message from CVS:
* ext/wavpack/gstwavpackenc.c: (gst_wavpack_enc_push_block):
Fix mem leak, send newsegment event on correction pad
as well (#352476).
* ext/wavpack/gstwavpackparse.c: (gst_wavpack_parse_base_init):
Restore original author (on Sebastian's request).
* tests/check/Makefile.am:
* tests/check/gst-plugins-bad.supp:
Add (so far empty) suppression file for -bad. Remove
wavpackenc test from VALGRIND_TO_FIX now that the leak
is fixed.