libztex: Don't return error when a bitstream was already configured

The high speed and low speed configureFpga functions should not return
an error when no bitstream needs to be downloaded. These codepaths are
not executed for now, because all calls to configureFpga set the force
parameter to true. Future commits may change that, allowing cgminer to
start mining immediately if each hardware has already been correctly
configured with firmware and bitstream(s).

libztex.c

@@ -284,7 +284,7 @@ static int libztex_configureFpgaHS(struct libztex_device *ztex, const char* firm
 	libztex_getFpgaState(ztex, &state);
 	if (!force && state.fpgaConfigured) {
 		applog(LOG_INFO, "Bitstream already configured");
-		return 1;
+		return 0;
 	}
 	cnt = libusb_control_transfer(ztex->hndl, 0xc0, 0x33, 0, 0, settings, 2, 1000);
 	if (unlikely(cnt < 0)) {
@@ -359,7 +359,7 @@ static int libztex_configureFpgaLS(struct libztex_device *ztex, const char* firm
 	libztex_getFpgaState(ztex, &state);
 	if (!force && state.fpgaConfigured) {
 		applog(LOG_DEBUG, "Bitstream already configured");
-		return 1;
+		return 0;
 	}
 
 	for (tries = 10; tries > 0; tries--) {