drm/amdgpu/powerplay: fix return codes in BACO code

Use a proper return code rather than -1.
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/vega10_baco.c

@@ -136,7 +136,7 @@ int vega10_baco_set_state(struct pp_hwmgr *hwmgr, enum BACO_STATE state)
 		if (soc15_baco_program_registers(hwmgr, pre_baco_tbl,
 					     ARRAY_SIZE(pre_baco_tbl))) {
 			if (smum_send_msg_to_smc(hwmgr, PPSMC_MSG_EnterBaco))
-				return -1;
+				return -EINVAL;
 
 			if (soc15_baco_program_registers(hwmgr, enter_baco_tbl,
 						   ARRAY_SIZE(enter_baco_tbl)))
@@ -154,5 +154,5 @@ int vega10_baco_set_state(struct pp_hwmgr *hwmgr, enum BACO_STATE state)
 		}
 	}
 
-	return -1;
+	return -EINVAL;
 }

drivers/gpu/drm/amd/powerplay/hwmgr/vega20_baco.c

@@ -89,14 +89,14 @@ int vega20_baco_set_state(struct pp_hwmgr *hwmgr, enum BACO_STATE state)
 
 
 		if(smum_send_msg_to_smc_with_parameter(hwmgr, PPSMC_MSG_EnterBaco, 0))
-			return -1;
+			return -EINVAL;
 
 	} else if (state == BACO_STATE_OUT) {
 		if (smum_send_msg_to_smc(hwmgr, PPSMC_MSG_ExitBaco))
-			return -1;
+			return -EINVAL;
 		if (!soc15_baco_program_registers(hwmgr, clean_baco_tbl,
 						     ARRAY_SIZE(clean_baco_tbl)))
-			return -1;
+			return -EINVAL;
 	}
 
 	return 0;