fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.

/*
 * This header file defines the loop-count timeout value that should
 * be passed to the rx_sim_byte() function.  By the spec we have to wait
 * 9600 etu's; at 3.25 MHz SIM clock and the default slow mode (no speed
 * enhancement) this 9600 etu number translates to about 1.10 s.
 *
 * The constant defined here has been calibrated empirically; the measured
 * timeout is about 1.38 s, giving us reasonable safety margin.
 */

#define	SIM_WAIT_TIMEOUT	6000000