criu/namespaces.c: fix pr_perror usage

1. No newline (pr_perror() already adds one for you)

2. No colon before file name, e.g.

WAS:	Can't open file: /some/file: permission denied
NOW:	Can't open file /some/file: permission denied

Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Dengguangxing <dengguangxing@huawei.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/namespaces.c

@@ -103,7 +103,7 @@ static int check_ns_file(char *ns_file)
 
 	ret = access(ns_file, 0);
 	if (ret < 0) {
-		pr_perror("Can't access join-ns file: %s", ns_file);
+		pr_perror("Can't access join-ns file %s", ns_file);
 		return -1;
 	}
 	return 0;
@@ -1539,7 +1539,7 @@ static int get_join_ns_fd(struct join_ns *jn)
 
 	fd = open(pnsf, O_RDONLY);
 	if (fd < 0) {
-		pr_perror("Can't open ns file: %s", pnsf);
+		pr_perror("Can't open ns file %s", pnsf);
 		return -1;
 	}
 	jn->ns_fd = fd;