Avoid duplication of code to read XLOG page

2019-11-25 18:16:29 Álvaro Herrera (alvherre) Closed in commitfest 2019-11 with status: Committed 2019-11-22 07:11:51 Michael Paquier (michael-kun) New status: Ready for Committer 2019-11-20 14:50:14 Antonin Houska (a.houska) New status: Needs review 2019-11-20 08:39:30 Michael Paquier (michael-kun) New status: Waiting on Author 2019-11-12 11:06:36 Antonin Houska (a.houska) New status: Needs review 2019-11-11 08:24:04 Michael Paquier (michael-kun) Added michael-kun as reviewer 2019-11-07 04:49:06 Michael Paquier (michael-kun) New status: Waiting on Author 2019-09-30 18:59:47 Álvaro Herrera (alvherre) Closed in commitfest 2019-09 with status: Moved to next CF 2019-09-23 21:04:28 Álvaro Herrera (alvherre) Added alvherre as committer 2019-09-23 10:44:44 Antonin Houska (a.houska) New status: Needs review 2019-09-06 14:54:59 Álvaro Herrera (alvherre) New status: Waiting on Author 2019-08-01 22:24:35 Thomas Munro (macdice) Closed in commitfest 2019-07 with status: Moved to next CF 2019-04-15 10:47:30 Antonin Houska (a.houska) Changed authors to Antonin Houska (a.houska) 2019-04-15 10:45:15 Antonin Houska (a.houska) Attached mail thread 14984.1554998742@spoje.net 2019-04-15 10:45:14 Antonin Houska (a.houska) Created patch record