libsnnet: remove capitalization and newline from error string
libsnnet: remove capitalization and newline from error string

golint requires that we have no capitalization or newline in error
strings.

Signed-off-by: Kristen Carlson Accardi <047ff8258f0113ece56e5e2fe9e0d987b14c4333@linux.intel.com>

erick0z/ciao,mcastelino/ciao,tpepper/ciao,tpepper/ciao,mcastelino/ciao,markdryan/ciao,erick0z/ciao,kaccardi/ciao,01org/ciao,wcwxyz/ciao,rbradford/ciao,kaccardi/ciao,obedmr/ciao,mrkz/ciao,mrkz/ciao,ciao-project/ciao,mcastelino/ciao,tpepper/ciao,rbradford/ciao,mrkz/ciao,matthewrsj/ciao,matthewrsj/ciao,obedmr/ciao,ciao-project/ciao,wcwxyz/ciao,erick0z/ciao,matthewrsj/ciao,markdryan/ciao,obedmr/ciao,01org/ciao,wcwxyz/ciao