repo: fix repo merge unit test

Enable asserts that accidentally excluded from normal test flow.

Signed-off-by: Markus Lehtonen <markus.lehtonen@intel.com>

pkg/repo/index_test.go

@@ -208,15 +208,16 @@ func TestMerge(t *testing.T) {
 
 	if len(ind1.Entries) != 2 {
 		t.Errorf("Expected 2 entries, got %d", len(ind1.Entries))
+	}
+
 	vs := ind1.Entries["dreadnought"]
 	if len(vs) != 2 {
 		t.Errorf("Expected 2 versions, got %d", len(vs))
 	}
-		v := vs[0]
-		if v.Version != "0.2.0" {
+
+	if v := vs[1]; v.Version != "0.2.0" {
 		t.Errorf("Expected %q version to be 0.2.0, got %s", v.Name, v.Version)
 	}
-	}
 
 }