From Philippe: TBuffer::MapObject can be called with a pointer worth '-1' in some cases.  Without the case, it tries to dereferences the pointer and of course crashes.
From Philippe:
TBuffer::MapObject can be called with a pointer worth '-1' in some cases.  Without the
case, it tries to dereferences the pointer and of course crashes.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@6497 27541ba8-7e3a-0410-8455-c3a389f83636

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