hs: Maybe don't use REND_DESC_ID_V2_LEN_BASE32 as the length for a base32 relay digest id
hs_lookup_last_hid_serv_request() defines an HSDir identity digest in base32 as:
char hsdir_id_base32[REND_DESC_ID_V2_LEN_BASE32 + 1];
Although the length is correct, semantically this is bad to use the base32 descriptor ID length for this.
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