Comment and function argument names are mismatched in bugmgr.c.

Hi all,

By commit 428b1d6b, function WritebackContextInit is added but the
comment of this function seems to be incorrect.
*max_coalesce variable doesn't exist at anywhere.
Also, I think it should be fixed that the argument name of this
function does not match function declare in buf_internal.h.
Patch for that attached.

bufmgr.c:L4160
/*
 * Initialize a writeback context, discarding potential previous state.
 *
 * *max_coalesce is a pointer to a variable containing the current maximum
 * number of writeback requests that will be coalesced into a bigger one. A
 * value <= 0 means that no writeback control will be performed. max_pending
 * is a pointer instead of an immediate value, so the coalesce limits can
 * easily changed by the GUC mechanism, and so calling code does not have to
 * check the current configuration.
 */
void
WritebackContextInit(WritebackContext *context, int *max_pending)
{
    Assert(*max_pending <= WRITEBACK_MAX_PENDING_FLUSHES);

    context->max_pending = max_pending;
    context->nr_pending = 0;
}

buf_internal.h:L303
/*
 * Internal routines: only called by bufmgr
 * Internal buffer management routines
 */
/* bufmgr.c */
extern void WritebackContextInit(WritebackContext *context, int *max_coalesce);


Regards,

--
Masahiko Sawada