fix coverity report: rx ry and rx were not deleted in tgraph2d3
fix coverity report: rx ry and rx were not deleted in tgraph2d3

simonpf/root,davidlt/root,root-mirror/root,mhuwiler/rootauto,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root-compressor-dummy,mhuwiler/rootauto,agarciamontoro/root,bbockelm/root,BerserkerTroll/root,BerserkerTroll/root,olifre/root,davidlt/root,zzxuanyuan/root-compressor-dummy,olifre/root,olifre/root,root-mirror/root,karies/root,zzxuanyuan/root,beniz/root,karies/root,mhuwiler/rootauto,root-mirror/root,agarciamontoro/root,BerserkerTroll/root,simonpf/root,davidlt/root,davidlt/root,zzxuanyuan/root-compressor-dummy,bbockelm/root,BerserkerTroll/root,BerserkerTroll/root,davidlt/root,simonpf/root,olifre/root,mhuwiler/rootauto,agarciamontoro/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,bbockelm/root,simonpf/root,root-mirror/root,zzxuanyuan/root-compressor-dummy,davidlt/root,mhuwiler/rootauto,simonpf/root,root-mirror/root,davidlt/root,olifre/root,karies/root,BerserkerTroll/root,mhuwiler/rootauto,zzxuanyuan/root,olifre/root,zzxuanyuan/root,bbockelm/root,simonpf/root,zzxuanyuan/root,agarciamontoro/root,davidlt/root,BerserkerTroll/root,beniz/root,karies/root,bbockelm/root,karies/root,beniz/root,karies/root,bbockelm/root,olifre/root,karies/root,simonpf/root,beniz/root,zzxuanyuan/root,simonpf/root,bbockelm/root,zzxuanyuan/root,olifre/root,zzxuanyuan/root,karies/root,agarciamontoro/root,root-mirror/root,zzxuanyuan/root-compressor-dummy,olifre/root,mhuwiler/rootauto,beniz/root,mhuwiler/rootauto,zzxuanyuan/root-compressor-dummy,BerserkerTroll/root,bbockelm/root,davidlt/root,agarciamontoro/root,mhuwiler/rootauto,BerserkerTroll/root,simonpf/root,beniz/root,zzxuanyuan/root,simonpf/root,zzxuanyuan/root,olifre/root,karies/root,beniz/root,bbockelm/root,davidlt/root,olifre/root,mhuwiler/rootauto,bbockelm/root,zzxuanyuan/root,root-mirror/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,beniz/root,zzxuanyuan/root,BerserkerTroll/root,karies/root,mhuwiler/rootauto,agarciamontoro/root,agarciamontoro/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,beniz/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,root-mirror/root,simonpf/root,karies/root,root-mirror/root,zzxuanyuan/root,beniz/root,bbockelm/root,beniz/root,davidlt/root,root-mirror/root,BerserkerTroll/root