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.

CC=	gcc
CFLAGS=	-O2 -I../include
PROG=	g23sh
OBJS=	init.o main.o pktsort.o sendsp.o usercmd.o
LIBS=	../libasync/libasync.a ../libg23/libg23.a
INSTBIN=/usr/local/bin

all:	${PROG}

${PROG}: ${OBJS} ${LIBS}
	${CC} ${CFLAGS} -o $@ ${OBJS} ${LIBS}

install:	${PROG}
	mkdir -p ${INSTBIN}
	install -c ${PROG} ${INSTBIN}

clean:
	rm -f *.o *.out *errs ${PROG}