lib-auth: Unescape passdb/userdb extra fields.

This only affected \001, \t, \r and \n characters which were left
tab-escaped (e.g. \t as "\001t").

src/lib-auth/auth-master.c

@@ -209,7 +209,7 @@ static bool auth_lookup_reply_callback(const char *cmd, const char *const *args,
 	if (ctx->return_value >= 0) {
 		ctx->fields = p_new(ctx->pool, const char *, len + 1);
 		for (i = 0; i < len; i++)
-			ctx->fields[i] = p_strdup(ctx->pool, args[i]);
+			ctx->fields[i] = str_tabunescape(p_strdup(ctx->pool, args[i]));
 	} else {
 		/* put the reason string into first field */
 		ctx->fields = p_new(ctx->pool, const char *, 2);