drm/amd/display: Clean up some inconsistent indenting

No functional modification involved.

smatch warning:

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_dpp_cm.c:67 dpp30_get_gamcor_current() warn: inconsistent indenting.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp_cm.c

@@ -61,23 +61,20 @@ static enum dc_lut_mode dpp30_get_gamcor_current(struct dpp *dpp_base)
 	uint32_t lut_mode;
 	struct dcn3_dpp *dpp = TO_DCN30_DPP(dpp_base);
 
-	REG_GET(CM_GAMCOR_CONTROL,
-			CM_GAMCOR_MODE_CURRENT, &state_mode);
+	REG_GET(CM_GAMCOR_CONTROL, CM_GAMCOR_MODE_CURRENT, &state_mode);
 
-		if (state_mode == 0)
-			mode = LUT_BYPASS;
+	if (state_mode == 0)
+		mode = LUT_BYPASS;
 
-		if (state_mode == 2) {//Programmable RAM LUT
-			REG_GET(CM_GAMCOR_CONTROL,
-					CM_GAMCOR_SELECT_CURRENT, &lut_mode);
-
-			if (lut_mode == 0)
-				mode = LUT_RAM_A;
-			else
-				mode = LUT_RAM_B;
-		}
+	if (state_mode == 2) {//Programmable RAM LUT
+		REG_GET(CM_GAMCOR_CONTROL, CM_GAMCOR_SELECT_CURRENT, &lut_mode);
+		if (lut_mode == 0)
+			mode = LUT_RAM_A;
+		else
+			mode = LUT_RAM_B;
+	}
 
-		return mode;
+	return mode;
 }
 
 static void dpp3_program_gammcor_lut(