Check the height and width values read.
Check the height and width values read.

Fixes CID 55831
nichwall/cuberite,tonibm19/cuberite,Howaner/MCServer,marvinkopf/cuberite,SamOatesPlugins/cuberite,johnsoch/cuberite,Fighter19/cuberite,QUSpilPrgm/cuberite,linnemannr/MCServer,nevercast/cuberite,nichwall/cuberite,HelenaKitty/EbooMC,Howaner/MCServer,Altenius/cuberite,zackp30/cuberite,zackp30/cuberite,Haxi52/cuberite,linnemannr/MCServer,electromatter/cuberite,johnsoch/cuberite,Fighter19/cuberite,mjssw/cuberite,nevercast/cuberite,nicodinh/cuberite,birkett/MCServer,Howaner/MCServer,thetaeo/cuberite,HelenaKitty/EbooMC,nounoursheureux/MCServer,Fighter19/cuberite,johnsoch/cuberite,thetaeo/cuberite,kevinr/cuberite,Howaner/MCServer,Haxi52/cuberite,electromatter/cuberite,nicodinh/cuberite,Tri125/MCServer,birkett/cuberite,birkett/cuberite,thetaeo/cuberite,ionux/MCServer,mmdk95/cuberite,guijun/MCServer,tonibm19/cuberite,nounoursheureux/MCServer,zackp30/cuberite,mc-server/MCServer,jammet/MCServer,nounoursheureux/MCServer,birkett/cuberite,Tri125/MCServer,mjssw/cuberite,kevinr/cuberite,Tri125/MCServer,bendl/cuberite,jammet/MCServer,bendl/cuberite,guijun/MCServer,HelenaKitty/EbooMC,birkett/cuberite,linnemannr/MCServer,tonibm19/cuberite,birkett/MCServer,nichwall/cuberite,jammet/MCServer,jammet/MCServer,tonibm19/cuberite,johnsoch/cuberite,marvinkopf/cuberite,nicodinh/cuberite,Altenius/cuberite,Haxi52/cuberite,mc-server/MCServer,QUSpilPrgm/cuberite,Haxi52/cuberite,mmdk95/cuberite,thetaeo/cuberite,guijun/MCServer,mc-server/MCServer,mmdk95/cuberite,ionux/MCServer,SamOatesPlugins/cuberite,nichwall/cuberite,mmdk95/cuberite,mc-server/MCServer,electromatter/cuberite,ionux/MCServer,HelenaKitty/EbooMC,nounoursheureux/MCServer,electromatter/cuberite,QUSpilPrgm/cuberite,Haxi52/cuberite,ionux/MCServer,QUSpilPrgm/cuberite,Frownigami1/cuberite,nichwall/cuberite,Tri125/MCServer,jammet/MCServer,Schwertspize/cuberite,SamOatesPlugins/cuberite,birkett/MCServer,Frownigami1/cuberite,nevercast/cuberite,Frownigami1/cuberite,guijun/MCServer,mmdk95/cuberite,Schwertspize/cuberite,johnsoch/cuberite,kevinr/cuberite,zackp30/cuberite,nichwall/cuberite,birkett/MCServer,birkett/cuberite,ionux/MCServer,QUSpilPrgm/cuberite,kevinr/cuberite,marvinkopf/cuberite,mjssw/cuberite,tonibm19/cuberite,Tri125/MCServer,mmdk95/cuberite,nounoursheureux/MCServer,jammet/MCServer,guijun/MCServer,linnemannr/MCServer,zackp30/cuberite,Frownigami1/cuberite,mc-server/MCServer,kevinr/cuberite,Tri125/MCServer,mjssw/cuberite,nicodinh/cuberite,Altenius/cuberite,marvinkopf/cuberite,Schwertspize/cuberite,Frownigami1/cuberite,electromatter/cuberite,nicodinh/cuberite,Fighter19/cuberite,marvinkopf/cuberite,bendl/cuberite,Howaner/MCServer,birkett/MCServer,Altenius/cuberite,nevercast/cuberite,linnemannr/MCServer,electromatter/cuberite,QUSpilPrgm/cuberite,tonibm19/cuberite,linnemannr/MCServer,Howaner/MCServer,thetaeo/cuberite,mjssw/cuberite,mc-server/MCServer,birkett/MCServer,HelenaKitty/EbooMC,nevercast/cuberite,Fighter19/cuberite,bendl/cuberite,SamOatesPlugins/cuberite,SamOatesPlugins/cuberite,nevercast/cuberite,Schwertspize/cuberite,bendl/cuberite,ionux/MCServer,thetaeo/cuberite,nicodinh/cuberite,nounoursheureux/MCServer,mjssw/cuberite,Haxi52/cuberite,zackp30/cuberite,birkett/cuberite,Fighter19/cuberite,guijun/MCServer,Schwertspize/cuberite,Altenius/cuberite,kevinr/cuberite,marvinkopf/cuberite