drm/amd/display/dc/dce/dce_link_encoder: Remove unused variable 'value0'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_link_encoder.c: In function ‘dce110_link_encoder_update_mst_stream_allocation_table’:
 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_link_encoder.c:1506:11: warning: variable ‘value0’ set but not used [-Wunused-but-set-variable]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Mauro Rossi <issor.oruam@gmail.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c

@@ -1503,7 +1503,6 @@ void dce110_link_encoder_update_mst_stream_allocation_table(
 	const struct link_mst_stream_allocation_table *table)
 {
 	struct dce110_link_encoder *enc110 = TO_DCE110_LINK_ENC(enc);
-	uint32_t value0 = 0;
 	uint32_t value1 = 0;
 	uint32_t value2 = 0;
 	uint32_t slots = 0;
@@ -1604,7 +1603,7 @@ void dce110_link_encoder_update_mst_stream_allocation_table(
 	do {
 		udelay(10);
 
-		value0 = REG_READ(DP_MSE_SAT_UPDATE);
+		REG_READ(DP_MSE_SAT_UPDATE);
 
 		REG_GET(DP_MSE_SAT_UPDATE,
 				DP_MSE_SAT_UPDATE, &value1);