util.c: fix minor compilation warnings

  CC     util.lo
util.c: In function ‘get_mem’:
util.c:366: warning: comparison between signed and unsigned
util.c: In function ‘close_fds’:
util.c:544: warning: comparison between signed and unsigned
util.c: In function ‘remove_names’:
util.c:615: warning: comparison between signed and unsigned

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed