files-reg: discover file system type only if file is going to be dumped
files-reg: discover file system type only if file is going to be dumped

Instead of calling it in fill_fd_params_special (which is called for any found
path).
This reduces amount of system calls on dump.

Signed-off-by: Stanislav Kinsburskiy <43b28e187c4fe6e53d7ab0bb71957481e322f182@virtuozzo.com>
Acked-by: Andrei Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

eabatalov/criu,eabatalov/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,eabatalov/criu,eabatalov/criu,eabatalov/criu,KKoukiou/criu-remote,eabatalov/criu,KKoukiou/criu-remote,KKoukiou/criu-remote