transceiver: minor cleanup of sample type sizing in uhd
transceiver: minor cleanup of sample type sizing in uhd

A small simplification of buffer indexing and sizing.

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: 504cad4147f1e500be0a169b9f46375eaf875953@2667 19bc5d8c-e614-43d4-8b26-e1612bc8e597

Djimmer/obts,dhenyjarasandy/openbts,brunoflce/pessoalopenBTS,xyzr0482/openbts,WindyCitySDR/openbts,hongyunnchen/openbts,WindyCitySDR/openbts,maxifree/openbts,dhenyjarasandy/openbts,hongyunnchen/openbts,endaga/openbts,RangeNetworks/openbts,maxifree/openbts,Djimmer/obts,Djimmer/obts,WindyCitySDR/openbts,maxifree/openbts,brunoflce/pessoalopenBTS,RangeNetworks/openbts,brunoflce/pessoalopenBTS,maxifree/openbts,RangeNetworks/openbts,WindyCitySDR/openbts,RangeNetworks/openbts,endaga/openbts,xyzr0482/openbts,endaga/openbts,WindyCitySDR/openbts,hongyunnchen/openbts,endaga/openbts,RangeNetworks/openbts,brunoflce/pessoalopenBTS,xyzr0482/openbts,dhenyjarasandy/openbts,dhenyjarasandy/openbts,hongyunnchen/openbts,brunoflce/pessoalopenBTS,maxifree/openbts,endaga/openbts,xyzr0482/openbts,xyzr0482/openbts,hongyunnchen/openbts,Djimmer/obts,RangeNetworks/openbts,Djimmer/obts,Djimmer/obts,dhenyjarasandy/openbts