Fix memory leak in TSelectorDraw::Begin
Fix memory leak in TSelectorDraw::Begin

In many error situations when function returns 
buffer for histogram name was not released
karies/root,olifre/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,karies/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root