isl_input_omega.c: fix check for memory allocation error

diff --git a/isl_input_omega.c b/isl_input_omega.c
index 200b4bb..eca06c0 100644 (file)
--- a/isl_input_omega.c
+++ b/isl_input_omega.c
@@ -90,7 +90,7 @@ static int vars_pos(struct vars *v, const char *s, int len)
        else {
                pos = v->n;
                v->v = variable_new(v, s, len, v->n);
-               if (!v)
+               if (!v->v)
                        return -1;
                v->n++;
        }