Check sh_entsize is not zero.

Check sh_entsize is not zero.

There were some recent bug reports where we trusted the ELF section header
to be sane and divided the sh_size by the sh_entsize to get the number of
objects in the section. This would cause a divide by zero if the file was
corrupt and the sh_entsize was zero. Add checks for any such code.

Signed-off-by: Mark Wielaard <mark@klomp.org>