bitfury: Remove unused libbitfury_readHashData

libbitfury.c

@@ -613,8 +613,3 @@ void libbitfury_sendHashData1(int chip_id, struct bitfury_device *d, struct thr_
 	
 	d->second_run = true;
 }
-
-int libbitfury_readHashData(unsigned int *res) {
-	return 0;
-}
-

libbitfury.h

@@ -59,7 +59,6 @@ struct bitfury_device {
 	time_t long_out_t;
 };
 
-int libbitfury_readHashData(unsigned int *res);
 extern void libbitfury_sendHashData1(int chip_id, struct bitfury_device *, struct thr_info *);
 void work_to_payload(struct bitfury_payload *p, struct work *w);
 extern void payload_to_atrvec(uint32_t *atrvec, struct bitfury_payload *);