Fix rchk warnings

[krlmlr]

Package RSQLite version 2.0
Package built using 73707/R 3.5.0; x86_64-pc-linux-gnu; 2017-11-10 16:56:28 UTC; unix   
Checked with rchk version 63f79d910f5835174fcaa5a0a7d2409348f7d2ac
More information at https://github.com/kalibera/cran-checks/blob/master/rchk/PROTECT.md

Function SqliteColumn::operator SEXPREC*() const
  [UP] allocating function ColumnStorage::copy_to(SEXPREC*, DATA_TYPE, int) const may destroy its unprotected argument (ret <arg 2>), which is later used. RSQLite/src/SqliteColumn.cpp:80

[github-actions]

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