fix unused function, variable return type warnings

indigo_drivers/aux_joystick/indigo_aux_joystick.c

@@ -835,6 +835,7 @@ static void *poll(indigo_device *device) {
 		}
 	}
 	INDIGO_DRIVER_LOG(DRIVER_NAME, "Joystick #%ld poll thread finished", index);
+	return NULL;
 }
 
 static void rescan() {

indigo_drivers/ccd_sbig/indigo_ccd_sbig.c

@@ -2304,8 +2304,6 @@ static bool plug_wheel(indigo_device *device, CFWResults cfwr) {
 
 static void unplug_wheel(char *master_name, int fw_model) {
 	int i;
-	sbig_private_data *pds[MAX_USB_DEVICES] = {NULL};
-
 	for(i = 0; i < MAX_DEVICES; i++) {
 		indigo_device *device = devices[i];
 		if (device == NULL) {
@@ -2329,8 +2327,6 @@ static void unplug_wheel(char *master_name, int fw_model) {
 
 static void unplug_ao(char *master_name) {
 	int i;
-	sbig_private_data *pds[MAX_USB_DEVICES] = {NULL};
-
 	for(i = 0; i < MAX_DEVICES; i++) {
 		indigo_device *device = devices[i];
 		if (device == NULL) {

indigo_drivers/mount_lx200/indigo_mount_lx200.c

@@ -3749,8 +3749,6 @@ static void onstep_aux_connect(indigo_device *device) {
 			*comma++ = '\0';
 			char *name = response;
 			onstep_aux_device_purpose purpose = *comma - '0';
-			char property_name[32];
-			indigo_property *aux_property = NULL;
 			if (purpose == ONSTEP_AUX_ANALOG) {
 				INDIGO_DRIVER_DEBUG(DRIVER_NAME, "Onstep AUX Heater Outlet at slot %d with name %s", i + 1, name);
 				ONSTEP_AUX_HEATER_OUTLET_MAPPING[ONSTEP_AUX_HEATER_OUTLET_COUNT] = i + 1;

indigo_drivers/mount_synscan/indigo_mount_synscan_mount.c

@@ -834,6 +834,8 @@ static int mount_guide_rate_percent(enum GuideRate rate) {
 		case kGuideRate_x1_00:
 			return 100;
 	}
+	return 0; //fallback should probably never be reached
+
 }
 
 void mount_handle_st4_guiding_rate(indigo_device *device) {

indigo_linux_drivers/aux_asiair/indigo_aux_asiair.c

@@ -503,7 +503,6 @@ bool asiair_export_all(bool use_pwm) {
 }
 
 bool asiair_unexport_all(bool use_pwm) {
-	int first = 0;
 	if (use_pwm) {
 		if (!asiair_pwm_unexport(0)) return false;
 		if (!asiair_pwm_unexport(1)) return false;

indigo_server/indigo_server.c

@@ -1898,7 +1898,6 @@ int main(int argc, const char * argv[]) {
 				char *server_string = strstr(server_argv[0], "indigo_server");
 				if (server_string) {
 					static char process_name[] = "indigo_worker";
-					int len = strlen(server_argv[0]);
 					strcpy(server_string, process_name);
 					prctl(PR_SET_PDEATHSIG, SIGINT, 0, 0, 0);
 					/* Linux requires additional step to change process name */

indigo_tools/indigo_raw_to_fits.c

@@ -207,7 +207,9 @@ int main(int argc, char *argv[]) {
 				fprintf(stderr, "Can not save '%s': %s\n", outfile_name, strerror(errno));
 				failed++;
 			} else {
-				not_quiet && printf("Converted '%s' -> '%s'\n", infile_name, outfile_name);
+				if (not_quiet) {
+					printf("Converted '%s' -> '%s'\n", infile_name, outfile_name);
+				}
 				succeeded++;
 			}
 			if (in_data) free(in_data);