fixed gcc warnings that call returns not checked
modified:   src/collect/collect.c
modified:   src/udev/udev-node.c
modified:   src/udev/udevadm-settle.c
modified:   src/udev/udevd.c
Merge pull request #90 from lhb-jr/fix_nocheckreturn

Fixed gcc warnings that call returns not checked

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>