osl_relation_replace_constraints(): fix tautology
osl_relation_replace_constraints(): fix tautology

The previous implementation self-compared a value instead of comparing
it to another value.

Signed-off-by: Harenome Ranaivoarivony-Razanajato <d371487b1a1f03ceb0067b64b8dd8af916c362ab@hareno.me>

ftynse/openscop,ftynse/openscop,ftynse/openscop,periscop/openscop,periscop/openscop,periscop/openscop