crypto: starfive - Skip unneeded key free

Skip unneeded kfree_sensitive if RSA module is using falback algo.

Signed-off-by: Jia Jie Ho <jiajie.ho@starfivetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/starfive/jh7110-rsa.c

@@ -45,6 +45,9 @@ static inline int starfive_pka_wait_done(struct starfive_cryp_ctx *ctx)
 
 static void starfive_rsa_free_key(struct starfive_rsa_key *key)
 {
+	if (!key->key_sz)
+		return;
+
 	kfree_sensitive(key->d);
 	kfree_sensitive(key->e);
 	kfree_sensitive(key->n);