page-read: remove redundant initialisation

previous init of pr->parent at line 220
Signed-off-by: Tikhomirov Pavel <snorcht@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

page-read.c

@@ -227,7 +227,6 @@ int open_page_read_at(int dfd, int pid, struct page_read *pr, int flags, bool sh
 		if (pr->fd_pg < 0)
 			return -1;
 
-		pr->parent = NULL;
 		pr->get_pagemap = get_page_vaddr;
 		pr->put_pagemap = NULL;
 		pr->read_page = read_page;