Issue 324: NameError: global name 'pid' is not defined
Issue 324: NameError: global name 'pid' is not defined

Incorrect use of 'pid' instead of 'self._pid' in exception string format.

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