Issue a more general message when the function which sets an option

fails.

It may fail not only because of an invalid value for the option, but
also for other reasons, e.g. memory problems etc.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22738 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

cmdutils.c

@@ -170,7 +170,7 @@ unknown_opt:
                 *po->u.float_arg = parse_number_or_die(opt, arg, OPT_FLOAT, -1.0/0.0, 1.0/0.0);
             } else if (po->flags & OPT_FUNC2) {
                 if (po->u.func2_arg(opt, arg) < 0) {
-                    fprintf(stderr, "%s: invalid value '%s' for option '%s'\n", argv[0], arg, opt);
+                    fprintf(stderr, "%s: failed to set value '%s' for option '%s'\n", argv[0], arg, opt);
                     exit(1);
                 }
             } else {