[PATCH 3/4] drm/amd/display: Use NULL instead of 0

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Silence the following sparse warnings:

../drivers/gpu/drm/amd/amdgpu/../display/dc/dce112/dce112_resource.c:865:16:
sparse: warning: Using plain integer as NULL pointer

../drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:1588:84:
sparse: warning: Using plain integer as NULL pointer

../drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:2725:84:
sparse: warning: Using plain integer as NULL pointer

../drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1919:16:
sparse: warning: Using plain integer as NULL pointer

Signed-off-by: Magali Lemes <magalilemes00@xxxxxxxxx>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c           | 2 +-
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 4 ++--
 drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c     | 4 +---
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 4367a6e0c224..cc8e60ec35c6 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1924,7 +1924,7 @@ static struct audio *find_first_free_audio(
 			return pool->audios[i];
 		}
 	}
-	return 0;
+	return NULL;
 }
 
 /*
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index ace04e2ed34e..8378b80e8517 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1585,7 +1585,7 @@ static enum dc_status apply_single_controller_ctx_to_hw(
 			hws->funcs.enable_stream_timing(pipe_ctx, context, dc);
 	}
 
-	pipe_ctx->plane_res.scl_data.lb_params.alpha_en = pipe_ctx->bottom_pipe != 0;
+	pipe_ctx->plane_res.scl_data.lb_params.alpha_en = pipe_ctx->bottom_pipe != NULL;
 
 	pipe_ctx->stream->link->psr_settings.psr_feature_enabled = false;
 
@@ -2722,7 +2722,7 @@ static void dce110_program_front_end_for_pipe(
 
 	pipe_ctx->plane_res.xfm->funcs->transform_set_gamut_remap(pipe_ctx->plane_res.xfm, &adjust);
 
-	pipe_ctx->plane_res.scl_data.lb_params.alpha_en = pipe_ctx->bottom_pipe != 0;
+	pipe_ctx->plane_res.scl_data.lb_params.alpha_en = pipe_ctx->bottom_pipe != NULL;
 
 	program_scaler(dc, pipe_ctx);
 
diff --git a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
index ee55cda854bf..8104c0c67f78 100644
--- a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
@@ -858,11 +858,9 @@ static struct clock_source *find_matching_pll(
 		return pool->clock_sources[DCE112_CLK_SRC_PLL4];
 	case TRANSMITTER_UNIPHY_F:
 		return pool->clock_sources[DCE112_CLK_SRC_PLL5];
-	default:
-		return NULL;
 	}
 
-	return 0;
+	return NULL;
 }
 
 static enum dc_status build_mapped_resource(
-- 
2.25.1




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