page-read: Don't check that an image file contains data

Modern tar and rsync can replace zero chunks with holes. So it's valid situation
and shouldn't abort the restore.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

page-read.c

@@ -141,10 +141,6 @@ static int read_pagemap_page(struct page_read *pr, unsigned long vaddr, void *bu
 		off_t current_vaddr = lseek(pr->fd_pg, 0, SEEK_CUR);
 		pr_debug("\tpr%u Read page %lx from self %lx/%"PRIx64"\n", pr->id,
 				vaddr, pr->cvaddr, current_vaddr);
-		if (current_vaddr != lseek(pr->fd_pg, current_vaddr, SEEK_DATA)) {
-			pr_perror("Can't read page because of hole /%"PRIx64, current_vaddr);
-			return -1;
-		}
 		ret = read(pr->fd_pg, buf, PAGE_SIZE);
 		if (ret != PAGE_SIZE) {
 			pr_perror("Can't read mapping page %d", ret);