[CRIU] criu dump failure for devpts type

[Amey Deshpande]

During experiments with criu v1.3-rc1 on containers, I've seen the
following error during checkpointing (highlights for readability):

...
(00.012148) Dump MNT namespace (mountpoints) 10 via 9445
...
(00.012232)     type devpts source devpts 13f / @ ./dev/pts flags 20000a
options gid=5,mode=620,ptmxmode=666,
...
(00.012402) Dumping mountpoints
...
(00.012459)     77: 13f:/ @ ./dev/pts
...
(00.012509) Error (mount.c:497): The file system 0x13f (0x10003f) devpts
./dev/pts is inaccessible

After rebooting the machine, the dev IDs are presumably reset, have smaller
values, and 'criu dump' on a similar container setup succeeds:

...
(01.460559) Dump MNT namespace (mountpoints) 10 via 1764
...
(01.460708)     type devpts source devpts 24 / @ ./dev/pts flags 20000a
options gid=5,mode=620,ptmxmode=666,
...
(01.461076) Dumping mountpoints
...
(01.461230)     72: 24:/ @ ./dev/pts
...
(01.730248) Dumping finished successfully

AFAICT, 'devpts' type is handled through phys_stat_resolve_dev(), and I
suspect that it doesn't correctly handle device numbers greater than 0xff.
 Is this a known issue?

Thanks,
Amey
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