gst/speexresample/gstspeexresample.c: The length for the buffer conversion function...

gst/speexresample/gstspeexresample.c: The length for the buffer conversion function is the number of audio frames, i....

Original commit message from CVS:
* gst/speexresample/gstspeexresample.c:
(gst_speex_resample_convert_buffer):
The length for the buffer conversion function is the number of
audio frames, i.e. we need to multiply it by the number of channels
to get the number of values. Also spotted by the unit test after
running in valgrind.