Better cleanup rule.

adsbus/Makefile

@@ -18,7 +18,7 @@ OBJ_PROTO = adsb.pb-c.o
 all: adsbus
 
 clean:
-	rm -rf *.o adsbus testout
+	rm -rf *.o adsbus testout findings
 
 %.o: %.c *.h
 	$(COMP) -c $(CFLAGS) $< -o $@
@@ -30,7 +30,8 @@ adsbus: adsbus.o $(OBJ_NETWORK) $(OBJ_PROTOCOL) $(OBJ_UTIL) $(OBJ_PROTO)
 	$(COMP) $(LDFLAGS) -o adsbus adsbus.o $(OBJ_NETWORK) $(OBJ_PROTOCOL) $(OBJ_UTIL) $(OBJ_PROTO) $(LIBS)
 
 fuzz:
-	test -d findings || mkdir findings
+	rm -rf findings
+	mkdir findings
 	$(MAKE) clean
 	COMP=afl-clang $(MAKE) adsbus
 	afl-fuzz -i testcase/ -o findings/ ./adsbus --stdin --stdout=airspy_adsb --stdout=beast --stdout=json --stdout=proto --stdout=raw --stdout=stats