file-utils: fix wrong condition in open_nointr (open returns -1 on error)
file-utils: fix wrong condition in open_nointr (open returns -1 on error)

This error was found by running Coverity.

Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

Distrotech/libgsystem,Distrotech/libgsystem,GNOME/libgsystem,GNOME/libgsystem