drm/amd/display: remove conversion to bool in dc_link_ddc.c

The '>' expression itself is bool, no need to convert it to bool again.
This fixes the following coccicheck warning:

drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c:602:28-33: WARNING:
conversion to bool not needed here
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -599,7 +599,7 @@ bool dal_ddc_submit_aux_command(struct ddc_service *ddc,
 	do {
 		struct aux_payload current_payload;
 		bool is_end_of_payload = (retrieved + DEFAULT_AUX_MAX_DATA_SIZE) >
-			payload->length ? true : false;
+			payload->length;
 
 		current_payload.address = payload->address;
 		current_payload.data = &payload->data[retrieved];