Fix inappropriate comments in function ReplicationSlotAcquire

[Wei Wang (Fujitsu)]

Hi,

In the function ReplicationSlotAcquire(), I found there is a missing in the
below comments:

```
        /*
         * Search for the slot with the specified name if the slot to acquire is
         * not given. If the slot is not found, we either return -1 or error 
out.
         */
        s = SearchNamedReplicationSlot(name, false);
        if (s == NULL || !s->in_use)
        {
                LWLockRelease(ReplicationSlotControlLock);

                ereport(ERROR,
                                (errcode(ERRCODE_UNDEFINED_OBJECT),
                                 errmsg("replication slot \"%s\" does not 
exist",
                                                name)));
        }
```

It seems that when the slot is not found, we will only error out and will not
return -1. Attach the patch to remove the inappropriate description of return
value.

Regards,
Wang Wei

v1-0001-Fix-inappropriate-comments-in-function-Replicatio.patch
Description: v1-0001-Fix-inappropriate-comments-in-function-Replicatio.patch