drm/amd/display: Fix unnecessary cast warnings from checkpatch

This patch addresses warnings produced by the checkpatch script
related to unnecessary casts that could potentially hide bugs.

The specific warnings are as follows:
- Warning at drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_wrapper.c:16
- Warning at drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_wrapper.c:20
- Warning at drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_wrapper.c:30

Acked-by: Alex Deucher <[email protected]>
Signed-off-by: Rohit Chavan <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: roheetchavan

drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_wrapper.c

@@ -13,11 +13,11 @@
 
 static bool dml21_allocate_memory(struct dml2_context **dml_ctx)
 {
-	*dml_ctx = (struct dml2_context *)kzalloc(sizeof(struct dml2_context), GFP_KERNEL);
+	*dml_ctx = kzalloc(sizeof(struct dml2_context), GFP_KERNEL);
 	if (!(*dml_ctx))
 		return false;
 
-	(*dml_ctx)->v21.dml_init.dml2_instance = (struct dml2_instance *)kzalloc(sizeof(struct dml2_instance), GFP_KERNEL);
+	(*dml_ctx)->v21.dml_init.dml2_instance = kzalloc(sizeof(struct dml2_instance), GFP_KERNEL);
 	if (!((*dml_ctx)->v21.dml_init.dml2_instance))
 		return false;
 
@@ -27,7 +27,7 @@ static bool dml21_allocate_memory(struct dml2_context **dml_ctx)
 	(*dml_ctx)->v21.mode_support.display_config = &(*dml_ctx)->v21.display_config;
 	(*dml_ctx)->v21.mode_programming.display_config = (*dml_ctx)->v21.mode_support.display_config;
 
-	(*dml_ctx)->v21.mode_programming.programming = (struct dml2_display_cfg_programming *)kzalloc(sizeof(struct dml2_display_cfg_programming), GFP_KERNEL);
+	(*dml_ctx)->v21.mode_programming.programming = kzalloc(sizeof(struct dml2_display_cfg_programming), GFP_KERNEL);
 	if (!((*dml_ctx)->v21.mode_programming.programming))
 		return false;