sysutils/samesame: unbreak with clang 4.0

src/mainAction.cpp:184:19: error: ordered comparison between pointer and zero ('FILE *' (aka '__sFILE *') and 'int')

if (pipeLeafs < 0)
    ~~~~~~~~~ ^ ~

src/mainAction.cpp:197:21: error: ordered comparison between pointer and zero ('FILE *' (aka '__sFILE *') and 'int')

if (outputLeafs < 0)
    ~~~~~~~~~~~ ^ ~

PR: 216636
Submitted by: akruijff@dds.nl
Approved by: portmgr blanket