Merge Debian's patch 408_passwd_check_arguments

* NEWS, src/passwd.c: Make sure that no more than one username
	argument was provided.

src/passwd.c

@@ -788,6 +788,12 @@ int main (int argc, char **argv)
 	else
 		name = myname;
 
+	/*
+	 * Make sure that at most one username was specified.
+	 */
+	if (argc > optind+1)
+		usage (E_USAGE);
+
 	/*
 	 * The -a flag requires -S, no other flags, no username, and
 	 * you must be root.  --marekm