Print out an informative message if the verbose option is given

and an unknown uid/gid is found in the file system.  This is useful
if you wind up with a file in your file system that has a uid
that is extremely large, since quotacheck will wind up running
a very very long time due to it not handling large gaps in uids
very well (this is a problem that should be addressed some day).

Update the man page to reflect that fact the the -v flag now prints
some additional diagnostic messages.

sbin/quotacheck/quotacheck.8

@@ -87,7 +87,7 @@ are to be checked.
 .It Fl v
 .Nm quotacheck
 reports discrepancies between the
-calculated and recorded disk quotas.
+calculated and recorded disk quotas and other additional diagnostic messages.
 .El
 .Pp
 Specifying both

sbin/quotacheck/quotacheck.c

@@ -512,8 +512,12 @@ addid(id, type, name)
 		highid[type] = id;
 	if (name)
 		bcopy(name, fup->fu_name, len + 1);
-	else
-		(void)sprintf(fup->fu_name, "%u", id);
+	else {
+		(void)sprintf(fup->fu_name, "%lu", id);
+		if (vflag) 
+			printf("unknown %cid: %lu\n", 
+			    type == USRQUOTA ? 'u' : 'g', id);
+	}
 	return (fup);
 }