drm/radeon: initialize sadb to NULL in the audio code

commit 83d04c39 upstream.

Fixes kfree of the sadb buffer when it's NULL.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
BugLink: http://bugs.launchpad.net/bugs/1402714
(backported from commit 83d04c39)
Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/gpu/drm/radeon/dce6_afmt.c

@@ -155,7 +155,7 @@ void dce6_afmt_write_speaker_allocation(struct drm_encoder *encoder)
 	struct drm_connector *connector;
 	struct radeon_connector *radeon_connector = NULL;
 	u32 offset, tmp;
-	u8 *sadb;
+	u8 *sadb = NULL;
 	int sad_count;
 
 	if (!dig || !dig->afmt || !dig->afmt->pin)

drivers/gpu/drm/radeon/evergreen_hdmi.c

@@ -102,7 +102,7 @@ static void dce4_afmt_write_speaker_allocation(struct drm_encoder *encoder)
 	struct drm_connector *connector;
 	struct radeon_connector *radeon_connector = NULL;
 	u32 tmp;
-	u8 *sadb;
+	u8 *sadb = NULL;
 	int sad_count;
 
 	list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) {

drivers/gpu/drm/radeon/r600_hdmi.c

@@ -326,7 +326,7 @@ static void dce3_2_afmt_write_speaker_allocation(struct drm_encoder *encoder)
 	struct drm_connector *connector;
 	struct radeon_connector *radeon_connector = NULL;
 	u32 tmp;
-	u8 *sadb;
+	u8 *sadb = NULL;
 	int sad_count;
 
 	/* XXX: setting this register causes hangs on some asics */