Relative Clauses of Result (Consecutive Relative Clauses) usually take the indicative (for οἷος, ὅσος with the infinitive see cross2497). The negative is οὐ when the relative clause approximates ὥστε (οὐ) with the indicative, as is generally the case when the main clause is negative, expressed or implied. Here ὅστις is commoner than ὅς. The negative is μή when the relative clause expresses an intended ( cross2557) or anticipated ( cross2558) result, where ὥστε μή with the infinitive would be less precise.
τίς οὕτω μαίνεται ὅστις οὐ βούλεται σοὶ φίλος εἶναι;
οὐδὲν γὰρ οὕτω βραχὺ ὅπλον ἑκάτεροι εἶχον ᾧ οὐκ ἐξι_κνοῦντο ἀλλήλων
a. The indicative with ἄν and the optative with ἄν are rare. Thus, τίς δ' ἦν οὕτως . . . μι_σαθήναιος, ὅστις ἐδυνήθη ἂν ἄτακτον αὑτὸν ὑπομεῖναι ἰδεῖν; who was such a hater of Athens that he could endure to see himself not at his post? Lyc. 39,
τίς οὕτως ἰσχυ_ρός, δς . . . ῥἱ_γει δύναιτ' ἂν μαχόμενος στρατεύεσθαι
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].