restore: Ignore ENOENT when preparing shared resources

The absent image file on shared resources preparation now means -- no resources
for this pid (zombies will not have these files).

This is not the most elegant solution, but I don't have anything better in mind.
Need to think over, all the more so we're most likely about to reimplement the
way image is stored some day in the future.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

cr-restore.c

@@ -285,8 +285,12 @@ static int prepare_shmem_pid(int pid)
 	int sh_fd;
 
 	sh_fd = open_image_ro(CR_FD_SHMEM, pid);
-	if (sh_fd < 0)
+	if (sh_fd < 0) {
+		if (errno == ENOENT)
+			return 0;
+		else
 			return -1;
+	}
 
 	while (1) {
 		struct shmem_entry e;
@@ -314,8 +318,12 @@ static int prepare_pipes_pid(int pid)
 	int p_fd;
 
 	p_fd = open_image_ro(CR_FD_PIPES, pid);
-	if (p_fd < 0)
+	if (p_fd < 0) {
+		if (errno == ENOENT)
+			return 0;
+		else
 			return -1;
+	}
 
 	while (1) {
 		struct pipe_entry e;

files.c

@@ -163,7 +163,9 @@ int prepare_fd_pid(int pid)
 
 	fdinfo_fd = open_image_ro(CR_FD_FDINFO, pid);
 	if (fdinfo_fd < 0) {
-		pr_perror("%d: Can't open fdinfo image\n", pid);
+		if (errno == ENOENT)
+			return 0;
+		else
 			return -1;
 	}