The latest patches to cr-service.c broke compilation with gcc-8:

criu/cr-service.c: In function ‘setup_opts_from_req’:
criu/cr-service.c:323:3: error: ‘strncpy’ specified bound 4096 equals destination size [-Werror=stringop-truncation]
   strncpy(images_dir_path, opts.imgs_dir, PATH_MAX);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
criu/cr-service.c:343:3: error: ‘strncpy’ specified bound 4096 equals destination size [-Werror=stringop-truncation]
   strncpy(work_dir_path, opts.work_dir, PATH_MAX);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

This fixes the errors by specifying the strncpy() size as 'PATH_MAX - 1'.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>