src: rename sun -> s redux
src: rename sun -> s redux

Like commit 05fccae but for another call site.  Overlooked in the
previous change, mea culpa.

bnoordhuis/node-unix-dgram,santigimeno/node-unix-dgram,bnoordhuis/node-unix-dgram,bnoordhuis/node-unix-dgram,santigimeno/node-unix-dgram,santigimeno/node-unix-dgram