Prevent /usr/bin/grops from dumping core with given an invalid argument value

with something such as

$ /usr/bin/grops -c a

Fix has been submitted upstream:

--- groff-1.22.2/src/devices/grops/ps.cpp.orig 2014-04-24 06:01:32.421674773 -0700

+++ groff-1.22.2/src/devices/grops/ps.cpp 2014-04-24 09:27:56.445423217 -0700

@@ -1803,7 +1803,7 @@

break;

case 'c':

if (sscanf(optarg, "%d", &ncopies) != 1 || ncopies <= 0) {

- error("bad number of copies `%s'", optarg);

+ error("bad number of copies `%1'", optarg);

ncopies = 1;

}

break;