bitwriter: fix compiler warning
bitwriter: fix compiler warning

Don't return a value from a function that doesn't
return a value using the returned value from a
function that also doesn't return a value.

gstbitwriter.h(265): warning C4098: 'gst_bit_writer_align_bytes_unchecked': 'void' function returning a value

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer