pgsql-server: Update comment to fix nibble mention: * We are not sure - Mailing list pgsql-committers

Log Message:
-----------
Update comment to fix nibble mention:

     * We are not sure how much precision is in tv_usec, so we
     * swap the high and low 16 bits of 'later' and XOR them with
     * 'earlier'. On the off chance that the result is 0, we
     * loop until it isn't.

Greg Stark

Modified Files:
--------------
    pgsql-server/src/backend/postmaster:
        postmaster.c (r1.427 -> r1.428)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/postmaster/postmaster.c.diff?r1=1.427&r2=1.428)