drivers: Use NUM_CHANNELS in favor of hardcoded values.

src/hardware/dreamsourcelab-dslogic/api.c

@@ -233,7 +233,7 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
 		/* Logic channels, all in one channel group. */
 		cg = g_malloc0(sizeof(struct sr_channel_group));
 		cg->name = g_strdup("Logic");
-		for (j = 0; j < 16; j++) {
+		for (j = 0; j < NUM_CHANNELS; j++) {
 			sprintf(channel_name, "%d", j);
 			ch = sr_channel_new(sdi, j, SR_CHANNEL_LOGIC,
 						TRUE, channel_name);

src/hardware/hantek-6xxx/api.c

@@ -530,7 +530,7 @@ static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 		return;
 	}
 
-	for (int ch = 0; ch < 2; ch++) {
+	for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 		if (!devc->ch_enabled[ch])
 			continue;
 

src/hardware/hantek-dso/api.c

@@ -613,7 +613,7 @@ static void send_chunk(struct sr_dev_inst *sdi, unsigned char *buf,
 	/* TODO: Check malloc return value. */
 	analog.data = g_try_malloc(num_samples * sizeof(float));
 
-	for (int ch = 0; ch < 2; ch++) {
+	for (int ch = 0; ch < NUM_CHANNELS; ch++) {
 		if (!devc->ch_enabled[ch])
 			continue;
 

src/hardware/hantek-dso/protocol.c

@@ -27,8 +27,6 @@
 #include "libsigrok-internal.h"
 #include "protocol.h"
 
-#define NUM_CHANNELS 2
-
 static int send_begin(const struct sr_dev_inst *sdi)
 {
 	struct sr_usb_dev_inst *usb;

src/hardware/hantek-dso/protocol.h

@@ -51,6 +51,8 @@
 /* All models have this for their "fast" mode. */
 #define FRAMESIZE_SMALL         (10 * 1024)
 
+#define NUM_CHANNELS		2
+
 enum control_requests {
 	CTRL_READ_EEPROM = 0xa2,
 	CTRL_GETSPEED = 0xb2,

src/hardware/lecroy-logicstudio/api.c

@@ -35,6 +35,8 @@
 #define UNKNOWN_ADDRESS 0xff
 #define MAX_RENUM_DELAY_MS 3000
 
+#define NUM_CHANNELS 16
+
 static const uint32_t drvopts[] = {
 	SR_CONF_LOGIC_ANALYZER,
 };
@@ -89,7 +91,7 @@ static struct sr_dev_inst *create_device(struct sr_usb_dev_inst *usb,
 	sdi->inst_type = SR_INST_USB;
 	sdi->conn = usb;
 
-	for (i = 0; i < 16; i++) {
+	for (i = 0; i < NUM_CHANNELS; i++) {
 		snprintf(channel_name, sizeof(channel_name), "D%i", i);
 		sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
 	}