Check redland using rchk

[gothub]

The rchk program checks C source code for potential memory protection errors. @cboettig and others has reported that this tool reports potential problems with the SWIG generated source.

Use this tool to find and fix memory problems.

[gothub]

CRAN package checks flagged the 1.10.17-10 release as getting a warning from rchk as shown here:
https://raw.githubusercontent.com/kalibera/cran-checks/master/rchk/results/redland.out

Package redland version 1.0.17-10
Package built using 76738/R 3.7.0; x86_64-pc-linux-gnu; 2019-06-27 01:24:38 UTC; unix   
Checked with rchk version 6400f4a0aa14a4379fcc72d8dbf07a49b4725e07
More information at https://github.com/kalibera/cran-checks/blob/master/rchk/PROTECT.md

Function SWIG_R_NewPointerObj
  [UP] calling allocating function R_MakeExternalPtr with argument allocated using R_MakeExternalPtr redland/src/redland.c:977

This rchk violation was fixed in commit 27f5842.

The package was checked on Ubuntu 17.10 using the directions posted here: https://github.com/kalibera/rchk and the checked passed