fix compilation warning on Solaris
fix compilation warning on Solaris

vmolsa/psutil,stupidcache/psutil,djhaskin987/psutil,jucapj/psutil,huson2012/psutil,huson2012/psutil,djhaskin987/psutil,end18/psutil,shiva21/psutil,marmolu/psutil,tigerneil/psutil,google-code-export/psutil,skyshe/psutil,djhaskin987/psutil,kiranvizru/psutil,AlanZatarain/psutil,google-code-export/psutil,creativewild/psutil,AlanZatarain/psutil,peter-hst/psutil,stupidcache/psutil,zhengzheng/psutil,google-code-export/psutil,kiranvizru/psutil,anfedorov/psutil,peter-hst/psutil,end18/psutil,skyshe/psutil,tigerneil/psutil,chjwang/psutil,djhaskin987/psutil,nmani1905/psutil,vmolsa/psutil,kiranvizru/psutil,creativewild/psutil,chjwang/psutil,Alwnikrotikz/psutil,tigerneil/psutil,PFZheng/psutil,creativewild/psutil,kiranvizru/psutil,skyshe/psutil,end18/psutil,Alwnikrotikz/psutil,skyshe/psutil,nmani1905/psutil,PFZheng/psutil,marmolu/psutil,vmolsa/psutil,anfedorov/psutil,shiva21/psutil,zhengzheng/psutil,huson2012/psutil,vmolsa/psutil,google-code-export/psutil,end18/psutil,jucapj/psutil,tigerneil/psutil,stupidcache/psutil