#6 Usage message should be "pid-file"

[jon labadie]

In ez-ipupdate.c, function print_usage, the long form of the -F option is reported as "pidfile". The code, in several places, shows this should be "pid-file". Change

fprintf(stdout, "  -F, --pidfile <file>\t\tuse <file> as a pid file\n");

to
fprintf(stdout, " -F, --pid-file <file>\t\tuse <file> as a pid file\n");