When checkpointing applications with really big memory slab
(like in our vz7 test with 920G of memory) the int type get
cutted, we should use long int instead, just like we do in
other code pieces.

Otherwise get

 | pie: 756: Daemon waits for command
 | (01.193097) Wait for ack 12 on daemon socket
 | (01.193112) Fetched ack: 12 12 0
 | (01.193164) 988065 fdinfo 0: pos:                0 flags:           100002/0
 | (01.193201) fdinfo: type: 0xb flags: 0100002/0 pos:        0 fd: 0
 | (01.193279) 988065 fdinfo 1: pos:                0 flags:           100002/0
 | (01.193307) fdinfo: type: 0xb flags: 0100002/0 pos:        0 fd: 1
 | (01.193341) 988065 fdinfo 2: pos:                0 flags:           100002/0
 | (01.193365) fdinfo: type: 0xb flags: 0100002/0 pos:        0 fd: 2
 | (01.193375) ----------------------------------------
 | (01.193405) Error (criu/parasite-syscall.c:243): BUG at criu/parasite-syscall.c:243
 | pie: 756: Error (criu/pie/parasite.c:676): Trimmed message received (1>

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>