From Andrei: Add a protection in TGeoPgon::Safety found by running stressGeometry under valgrind by Axel.
From Andrei:
Add a protection in TGeoPgon::Safety found by running stressGeometry under valgrind by Axel.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@21698 27541ba8-7e3a-0410-8455-c3a389f83636

esakellari/root,pspe/root,evgeny-boger/root,nilqed/root,sirinath/root,arch1tect0r/root,Dr15Jones/root,georgtroska/root,thomaskeck/root,root-mirror/root,omazapa/root-old,jrtomps/root,abhinavmoudgil95/root,veprbl/root,lgiommi/root,esakellari/my_root_for_test,gganis/root,BerserkerTroll/root,gbitzes/root,0x0all/ROOT,perovic/root,simonpf/root,BerserkerTroll/root,cxx-hep/root-cern,veprbl/root,simonpf/root,ffurano/root5,sbinet/cxx-root,zzxuanyuan/root,georgtroska/root,omazapa/root,evgeny-boger/root,satyarth934/root,zzxuanyuan/root,esakellari/my_root_for_test,lgiommi/root,mattkretz/root,BerserkerTroll/root,Duraznos/root,omazapa/root-old,simonpf/root,strykejern/TTreeReader,davidlt/root,esakellari/root,smarinac/root,vukasinmilosevic/root,perovic/root,cxx-hep/root-cern,karies/root,smarinac/root,nilqed/root,zzxuanyuan/root,gganis/root,gganis/root,Duraznos/root,root-mirror/root,georgtroska/root,georgtroska/root,krafczyk/root,0x0all/ROOT,agarciamontoro/root,krafczyk/root,alexschlueter/cern-root,sawenzel/root,thomaskeck/root,krafczyk/root,georgtroska/root,esakellari/root,esakellari/root,zzxuanyuan/root-compressor-dummy,jrtomps/root,olifre/root,dfunke/root,strykejern/TTreeReader,Duraznos/root,sirinath/root,vukasinmilosevic/root,root-mirror/root,bbockelm/root,lgiommi/root,mkret2/root,nilqed/root,mkret2/root,vukasinmilosevic/root,BerserkerTroll/root,mattkretz/root,beniz/root,mhuwiler/rootauto,bbockelm/root,bbockelm/root,nilqed/root,nilqed/root,mattkretz/root,sawenzel/root,buuck/root,0x0all/ROOT,zzxuanyuan/root-compressor-dummy,veprbl/root,esakellari/root,olifre/root,kirbyherm/root-r-tools,davidlt/root,Dr15Jones/root,omazapa/root-old,mkret2/root,jrtomps/root,alexschlueter/cern-root,zzxuanyuan/root,root-mirror/root,0x0all/ROOT,gganis/root,Dr15Jones/root,lgiommi/root,georgtroska/root,gbitzes/root,vukasinmilosevic/root,ffurano/root5,sbinet/cxx-root,tc3t/qoot,Duraznos/root,zzxuanyuan/root-compressor-dummy,BerserkerTroll/root,sirinath/root,CristinaCristescu/root,beniz/root,mattkretz/root,sawenzel/root,jrtomps/root,pspe/root,gganis/root,karies/root,perovic/root,georgtroska/root,simonpf/root,alexschlueter/cern-root,Dr15Jones/root,zzxuanyuan/root,abhinavmoudgil95/root,davidlt/root,tc3t/qoot,veprbl/root,gganis/root,sbinet/cxx-root,krafczyk/root,evgeny-boger/root,thomaskeck/root,sawenzel/root,alexschlueter/cern-root,mhuwiler/rootauto,dfunke/root,esakellari/root,sawenzel/root,Duraznos/root,perovic/root,ffurano/root5,omazapa/root-old,jrtomps/root,strykejern/TTreeReader,karies/root,veprbl/root,buuck/root,evgeny-boger/root,lgiommi/root,esakellari/my_root_for_test,dfunke/root,agarciamontoro/root,esakellari/my_root_for_test,veprbl/root,bbockelm/root,omazapa/root-old,strykejern/TTreeReader,Y--/root,pspe/root,simonpf/root,buuck/root,sirinath/root,Duraznos/root,pspe/root,gganis/root,lgiommi/root,mkret2/root,satyarth934/root,vukasinmilosevic/root,arch1tect0r/root,strykejern/TTreeReader,zzxuanyuan/root-compressor-dummy,mhuwiler/rootauto,tc3t/qoot,buuck/root,satyarth934/root,davidlt/root,ffurano/root5,beniz/root,esakellari/my_root_for_test,agarciamontoro/root,sirinath/root,veprbl/root,abhinavmoudgil95/root,olifre/root,zzxuanyuan/root,omazapa/root,esakellari/my_root_for_test,satyarth934/root,BerserkerTroll/root,gbitzes/root,karies/root,abhinavmoudgil95/root,smarinac/root,davidlt/root,cxx-hep/root-cern,zzxuanyuan/root-compressor-dummy,esakellari/my_root_for_test,jrtomps/root,krafczyk/root,pspe/root,gbitzes/root,esakellari/root,sawenzel/root,omazapa/root-old,beniz/root,vukasinmilosevic/root,cxx-hep/root-cern,arch1tect0r/root,zzxuanyuan/root,Duraznos/root,kirbyherm/root-r-tools,Dr15Jones/root,sbinet/cxx-root,root-mirror/root,abhinavmoudgil95/root,satyarth934/root,gganis/root,simonpf/root,tc3t/qoot,karies/root,omazapa/root,buuck/root,lgiommi/root,veprbl/root,0x0all/ROOT,CristinaCristescu/root,karies/root,davidlt/root,tc3t/qoot,pspe/root,kirbyherm/root-r-tools,thomaskeck/root,sirinath/root,buuck/root,gganis/root,beniz/root,abhinavmoudgil95/root,omazapa/root-old,jrtomps/root,agarciamontoro/root,karies/root,mhuwiler/rootauto,omazapa/root,arch1tect0r/root,gbitzes/root,mhuwiler/rootauto,simonpf/root,Duraznos/root,nilqed/root,smarinac/root,Y--/root,abhinavmoudgil95/root,omazapa/root,agarciamontoro/root,evgeny-boger/root,evgeny-boger/root,Duraznos/root,omazapa/root,buuck/root,root-mirror/root,vukasinmilosevic/root,pspe/root,zzxuanyuan/root,perovic/root,gbitzes/root,karies/root,thomaskeck/root,mkret2/root,omazapa/root-old,thomaskeck/root,smarinac/root,BerserkerTroll/root,mattkretz/root,Dr15Jones/root,satyarth934/root,omazapa/root,dfunke/root,gbitzes/root,0x0all/ROOT,CristinaCristescu/root,smarinac/root,Y--/root,zzxuanyuan/root-compressor-dummy,abhinavmoudgil95/root,strykejern/TTreeReader,sawenzel/root,mattkretz/root,krafczyk/root,evgeny-boger/root,BerserkerTroll/root,lgiommi/root,omazapa/root-old,bbockelm/root,veprbl/root,zzxuanyuan/root-compressor-dummy,perovic/root,kirbyherm/root-r-tools,davidlt/root,omazapa/root,jrtomps/root,olifre/root,beniz/root,bbockelm/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