From 64f628bf8a7b94073de14e34d70a2b23c955f1b0 Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Wed, 17 May 2017 01:07:56 +0200
Subject: [PATCH] hantek-6xxx: Only list DC coupling once.

Avoid incorrect indexing and the follow-up segfault.

This fixes bug #822.
---
 src/hardware/hantek-6xxx/api.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/hardware/hantek-6xxx/api.c b/src/hardware/hantek-6xxx/api.c
index c05290be..08062add 100644
--- a/src/hardware/hantek-6xxx/api.c
+++ b/src/hardware/hantek-6xxx/api.c
@@ -52,7 +52,7 @@ static const char *channel_names[] = {
 };
 
 static const char *dc_coupling[] = {
-	"DC", "DC",
+	"DC",
 };
 
 static const char *acdc_coupling[] = {
@@ -385,7 +385,8 @@ static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *s
 			*data = g_variant_new("(tt)", vdiv[0], vdiv[1]);
 			break;
 		case SR_CONF_COUPLING:
-			*data = g_variant_new_string(devc->coupling_vals[devc->coupling[ch_idx]]);
+			*data = g_variant_new_string((devc->coupling[ch_idx] \
+					== COUPLING_DC) ? "DC" : "AC");
 			break;
 		}
 	}