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
OBJS=	duart28c.o etmoff.o forkoff.o readconf.o
LIB=	libpwon.a

all:	${LIB}

${LIB}:	${OBJS}
	ar rcu $@ ${OBJS}
	ranlib $@

clean:
	rm -f *.[oa] errs