sr: s/SR_{USB,SERIAL}_INST/SR_INST_{USB,SERIAL}/.

hardware/link-mso19/link-mso19.c

@@ -691,7 +691,8 @@ static int receive_data(int fd, int revents, void *cb_data)
 	double analog_out[1024];
 	size_t i, s;
 
-	revents = revents;
+	/* Avoid compiler warnings. */
+	(void)revents;
 
 	s = serial_read(fd, in, sizeof(in));
 	if (s <= 0)

sigrok.h

@@ -288,8 +288,10 @@ struct sr_dev_inst {
 
 /* sr_dev_inst types */
 enum {
-	SR_USB_INST,
-	SR_SERIAL_INST,
+	/** Device instance type for USB devices. */
+	SR_INST_USB,
+	/** Device instance type for serial port devices. */
+	SR_INST_SERIAL,
 };
 
 /* Device instance status */