fix compiler warning
fix compiler warning

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