bplist: Fix integer overflow check (offset table size)
bplist: Fix integer overflow check (offset table size)

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