drm/amd/display: fix use of uninitialized variable

tg_inst may be used uninitialized, so initialize it to 0.
Signed-off-by: Martin Leung <martin.leung@amd.com>
Reviewed-by: Jaehyun Chung <Jaehyun.Chung@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -974,7 +974,7 @@ bool dc_validate_seamless_boot_timing(const struct dc *dc,
 {
 	struct timing_generator *tg;
 	struct dc_link *link = sink->link;
-	unsigned int enc_inst, tg_inst, i;
+	unsigned int i, enc_inst, tg_inst = 0;
 
 	// Seamless port only support single DP and EDP so far
 	if (sink->sink_signal != SIGNAL_TYPE_DISPLAY_PORT &&

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -1848,7 +1848,7 @@ static int acquire_resource_from_hw_enabled_state(
 		struct dc_stream_state *stream)
 {
 	struct dc_link *link = stream->link;
-	unsigned int inst, tg_inst, i;
+	unsigned int i, inst, tg_inst = 0;
 
 	/* Check for enabled DIG to identify enabled display */
 	if (!link->link_enc->funcs->is_dig_enabled(link->link_enc))