xplist: Fix OOB read when parsing DOCTYPE
xplist: Fix OOB read when parsing DOCTYPE

libimobiledevice/libplist,libimobiledevice-win32/libplist,libimobiledevice/libplist,Tatsh/libplist,Tatsh/libplist,libimobiledevice/libplist,Tatsh/libplist,libimobiledevice-win32/libplist,libimobiledevice-win32/libplist,libimobiledevice-win32/libplist,Tatsh/libplist