serial: Shorten a few code snippets.

src/serial.c

@@ -55,12 +55,10 @@
 
 #ifdef HAVE_SERIAL_COMM
 
-/* See if a (assumed opened) serial port is of any supported type. */
+/* See if an (assumed opened) serial port is of any supported type. */
 static int dev_is_supported(struct sr_serial_dev_inst *serial)
 {
-	if (!serial)
+	if (!serial || !serial->lib_funcs)
-		return 0;
-	if (!serial->lib_funcs)
 		return 0;
 
 	return 1;
@@ -270,9 +268,7 @@ SR_PRIV int serial_set_read_chunk_cb(struct sr_serial_dev_inst *serial,
  */
 SR_PRIV void sr_ser_discard_queued_data(struct sr_serial_dev_inst *serial)
 {
-	if (!serial)
+	if (!serial || !serial->rcv_buffer)
-		return;
-	if (!serial->rcv_buffer)
 		return;
 
 	g_string_truncate(serial->rcv_buffer, 0);
@@ -288,9 +284,7 @@ SR_PRIV void sr_ser_discard_queued_data(struct sr_serial_dev_inst *serial)
  */
 SR_PRIV size_t sr_ser_has_queued_data(struct sr_serial_dev_inst *serial)
 {
-	if (!serial)
+	if (!serial || !serial->rcv_buffer)
-		return 0;
-	if (!serial->rcv_buffer)
 		return 0;
 
 	return serial->rcv_buffer->len;
@@ -309,9 +303,7 @@ SR_PRIV size_t sr_ser_has_queued_data(struct sr_serial_dev_inst *serial)
 SR_PRIV void sr_ser_queue_rx_data(struct sr_serial_dev_inst *serial,
 	const uint8_t *data, size_t len)
 {
-	if (!serial)
+	if (!serial || !data || !len)
-		return;
-	if (!data || !len)
 		return;
 
 	if (serial->rx_chunk_cb_func)
@@ -336,9 +328,7 @@ SR_PRIV size_t sr_ser_unqueue_rx_data(struct sr_serial_dev_inst *serial,
 	size_t qlen;
 	GString *buf;
 
-	if (!serial)
+	if (!serial || !data || !len)
-		return 0;
-	if (!data || !len)
 		return 0;
 
 	qlen = sr_ser_has_queued_data(serial);
@@ -1027,9 +1017,7 @@ SR_PRIV GSList *sr_serial_find_usb(uint16_t vendor_id, uint16_t product_id)
 /** @private */
 SR_PRIV int serial_timeout(struct sr_serial_dev_inst *port, int num_bytes)
 {
-	int bits, baud;
+	int bits, baud, ret, timeout_ms;
-	int ret;
-	int timeout_ms;
 
 	/* Get the bitrate and frame length. */
 	bits = baud = 0;

src/serial_bt.c

@@ -494,10 +494,8 @@ static int ser_bt_read(struct sr_serial_dev_inst *serial,
 	 * Immediately satisfy the caller's request from the RX buffer
 	 * if the requested amount of data is available already.
 	 */
-	if (sr_ser_has_queued_data(serial) >= count) {
+	if (sr_ser_has_queued_data(serial) >= count)
-		rc = sr_ser_unqueue_rx_data(serial, buf, count);
+		return sr_ser_unqueue_rx_data(serial, buf, count);
-		return rc;
-	}
 
 	/*
 	 * When a timeout was specified, then determine the deadline
@@ -766,9 +764,8 @@ static void scan_cb(void *cb_args, const char *addr, const char *name)
 
 	/* Check whether the device was seen before. */
 	for (l = scan_args->addr_list; l; l = l->next) {
-		if (strcmp(addr, l->data) == 0) {
+		if (strcmp(addr, l->data) == 0)
 			return;
-		}
 	}
 
 	/* Substitute colons in the address by dashes. */

src/serial_hid.c

@@ -635,9 +635,8 @@ SR_PRIV const char *ser_hid_chip_find_name_vid_pid(uint16_t vid, uint16_t pid)
 		if (!vid_pids)
 			continue;
 		while (vid_pids->vid) {
-			if (vid_pids->vid == vid && vid_pids->pid == pid) {
+			if (vid_pids->vid == vid && vid_pids->pid == pid)
 				return desc->chipname;
-			}
 			vid_pids++;
 		}
 	}
@@ -1298,10 +1297,8 @@ static int ser_hid_read(struct sr_serial_dev_inst *serial,
 	 * Immediately satisfy the caller's request from the RX buffer
 	 * if the requested amount of data is available already.
 	 */
-	if (sr_ser_has_queued_data(serial) >= count) {
+	if (sr_ser_has_queued_data(serial) >= count)
-		rc = sr_ser_unqueue_rx_data(serial, buf, count);
+		return sr_ser_unqueue_rx_data(serial, buf, count);
-		return rc;
-	}
 
 	/*
 	 * When a timeout was specified, then determine the deadline
@@ -1387,9 +1384,8 @@ static int ser_hid_read(struct sr_serial_dev_inst *serial,
 	if (got > count)
 		got = count;
 	sr_dbg("DBG: %s() passing %d bytes.", __func__, got);
-	rc = sr_ser_unqueue_rx_data(serial, buf, count);
 
-	return rc;
+	return sr_ser_unqueue_rx_data(serial, buf, count);
 }
 
 static struct ser_lib_functions serlib_hid = {