BUG: Fix fid.close() to use os.close(fid)
BUG: Fix fid.close() to use os.close(fid)

The error snuk in with some other file closing fixes and found by
Warren Weckesser.

Closes gh-8013

simongibbons/numpy,utke1/numpy,ContinuumIO/numpy,WarrenWeckesser/numpy,AustereCuriosity/numpy,utke1/numpy,mhvk/numpy,grlee77/numpy,madphysicist/numpy,ahaldane/numpy,jakirkham/numpy,anntzer/numpy,simongibbons/numpy,mattip/numpy,ddasilva/numpy,bringingheavendown/numpy,b-carter/numpy,numpy/numpy,b-carter/numpy,grlee77/numpy,abalkin/numpy,simongibbons/numpy,seberg/numpy,ssanderson/numpy,ahaldane/numpy,charris/numpy,pizzathief/numpy,tacaswell/numpy,ssanderson/numpy,seberg/numpy,jakirkham/numpy,MSeifert04/numpy,Eric89GXL/numpy,tynn/numpy,pbrod/numpy,shoyer/numpy,anntzer/numpy,chatcannon/numpy,AustereCuriosity/numpy,solarjoe/numpy,gmcastil/numpy,numpy/numpy,pdebuyl/numpy,stuarteberg/numpy,bringingheavendown/numpy,ahaldane/numpy,behzadnouri/numpy,jorisvandenbossche/numpy,ContinuumIO/numpy,pbrod/numpy,njase/numpy,njase/numpy,WarrenWeckesser/numpy,dwillmer/numpy,shoyer/numpy,ContinuumIO/numpy,behzadnouri/numpy,chatcannon/numpy,pdebuyl/numpy,madphysicist/numpy,WarrenWeckesser/numpy,mattip/numpy,jorisvandenbossche/numpy,solarjoe/numpy,pbrod/numpy,chatcannon/numpy,maniteja123/numpy,simongibbons/numpy,madphysicist/numpy,tacaswell/numpy,anntzer/numpy,bertrand-l/numpy,Eric89GXL/numpy,pdebuyl/numpy,WarrenWeckesser/numpy,seberg/numpy,ssanderson/numpy,madphysicist/numpy,jorisvandenbossche/numpy,gfyoung/numpy,pizzathief/numpy,seberg/numpy,charris/numpy,pbrod/numpy,bertrand-l/numpy,rgommers/numpy,pizzathief/numpy,dwillmer/numpy,mhvk/numpy,endolith/numpy,mattip/numpy,tacaswell/numpy,skwbc/numpy,stuarteberg/numpy,simongibbons/numpy,gmcastil/numpy,bertrand-l/numpy,rgommers/numpy,dwillmer/numpy,jakirkham/numpy,gmcastil/numpy,shoyer/numpy,numpy/numpy,abalkin/numpy,skwbc/numpy,MSeifert04/numpy,AustereCuriosity/numpy,shoyer/numpy,gfyoung/numpy,stuarteberg/numpy,madphysicist/numpy,MSeifert04/numpy,charris/numpy,jakirkham/numpy,ahaldane/numpy,mattip/numpy,numpy/numpy,abalkin/numpy,mhvk/numpy,grlee77/numpy,mhvk/numpy,charris/numpy,pizzathief/numpy,endolith/numpy,shoyer/numpy,jorisvandenbossche/numpy,Eric89GXL/numpy,anntzer/numpy,mhvk/numpy,stuarteberg/numpy,jakirkham/numpy,WarrenWeckesser/numpy,endolith/numpy,MSeifert04/numpy,endolith/numpy,bringingheavendown/numpy,grlee77/numpy,pbrod/numpy,jorisvandenbossche/numpy,maniteja123/numpy,rgommers/numpy,pdebuyl/numpy,rgommers/numpy,tynn/numpy,utke1/numpy,njase/numpy,pizzathief/numpy,Eric89GXL/numpy,b-carter/numpy,grlee77/numpy,dwillmer/numpy,behzadnouri/numpy,maniteja123/numpy,ddasilva/numpy,MSeifert04/numpy,gfyoung/numpy,solarjoe/numpy,skwbc/numpy,ahaldane/numpy,tynn/numpy,ddasilva/numpy