Fix memory leak in GENERAL_NAME_set0_othername.

CLA: trivial
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4544)

crypto/x509v3/v3_genn.c

@@ -181,6 +181,7 @@ int GENERAL_NAME_set0_othername(GENERAL_NAME *gen,
     oth = OTHERNAME_new();
     if (oth == NULL)
         return 0;
+    ASN1_TYPE_free(oth->value);
     oth->type_id = oid;
     oth->value = value;
     GENERAL_NAME_set0_value(gen, GEN_OTHERNAME, oth);