[PATCH v2] a2dp: Fixed warn_unused_result warning

[Michał Lowas-Rzechonek <michal.lowas-rzechonek@xxxxxxxxxxx>]

This used to break builds when using maintainer mode via
./bootstrap-configure:

profiles/audio/a2dp.c:1775:2: error: ignoring return value of
    ‘asprintf’, declared with attribute warn_unused_result
    [-Werror=unused-result]
  asprintf(&sep->path, "%s/sep%d",
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
---
 profiles/audio/a2dp.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/profiles/audio/a2dp.c b/profiles/audio/a2dp.c
index 8f141739c..5f5ad508d 100644
--- a/profiles/audio/a2dp.c
+++ b/profiles/audio/a2dp.c
@@ -1772,8 +1772,15 @@ static void register_remote_sep(void *data, void *user_data)
 	if (!(g_dbus_get_flags() & G_DBUS_FLAG_ENABLE_EXPERIMENTAL))
 		goto done;
 
-	asprintf(&sep->path, "%s/sep%d", device_get_path(chan->device),
-							avdtp_get_seid(rsep));
+	if (asprintf(&sep->path, "%s/sep%d",
+				device_get_path(chan->device),
+				avdtp_get_seid(rsep)) < 0) {
+		error("Could not allocate path for remote sep %s/sep%d",
+				device_get_path(chan->device),
+				avdtp_get_seid(rsep));
+		sep->path = NULL;
+		goto done;
+	}
 
 	if (g_dbus_register_interface(btd_get_dbus_connection(),
 				sep->path, MEDIA_ENDPOINT_INTERFACE,
-- 
2.19.1