move usb_close to usbtmc, fix memory leak

[rigol] / Makefile

CFILES=rigol.c
OFILES=rigol.o png.o usbtmc.o commands.o
CFLAGS=-O2 -Wall
LDFLAGS=-lusb -lreadline -lz
CC=gcc

all: rigol raw2gp

rigol: $(OFILES)

rigol.o: rigol.c

clean:
	rm -f *.o rigol raw2gp *~