remove sh_link from section comparison

This sh_link line currently has a bug with both operands being sec1; the
second should be sec2.  However the bug is masking a logical flaw; that
is that the sh_link is the index of either the symtab or the strtab and
that can change if sections have been added or removed by the patch.

This commit removes the comparison.

Signed-off-by: Seth Jennings <sjenning@redhat.com>

Improves on #306