[PATCH] set_up_diff_cmd_and_options() doesn't accept NULL config

Hi,

set_up_diff_cmd_and_options()'s document says:

/* Initialize DIFF_CMD_BATON.diff_cmd and DIFF_CMD_BATON.options,
 * according to OPTIONS and CONFIG. CONFIG may be null.
 * Allocate the fields in POOL, which should be at least as long-lived
 * as the pool DIFF_CMD_BATON itself is allocated in.
 */

But it doesn't accept NULL as CONFIG.

Thanks,

--
kou

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