drm/amd/pm: Remove many unnecessary NULL values

Ther are many pointers assigned first, which need not to be initialized, so
remove the NULL assignment.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c

@@ -1237,7 +1237,7 @@ static int get_vce_clock_voltage_limit_table(struct pp_hwmgr *hwmgr,
 		const VCEClockInfoArray    *array)
 {
 	unsigned long i;
-	struct phm_vce_clock_voltage_dependency_table *vce_table = NULL;
+	struct phm_vce_clock_voltage_dependency_table *vce_table;
 
 	vce_table = kzalloc(struct_size(vce_table, entries, table->numEntries),
 			    GFP_KERNEL);

drivers/gpu/drm/amd/pm/powerplay/smumgr/ci_smumgr.c

@@ -2732,7 +2732,7 @@ static bool ci_is_dpm_running(struct pp_hwmgr *hwmgr)
 
 static int ci_smu_init(struct pp_hwmgr *hwmgr)
 {
-	struct ci_smumgr *ci_priv = NULL;
+	struct ci_smumgr *ci_priv;
 
 	ci_priv = kzalloc(sizeof(struct ci_smumgr), GFP_KERNEL);
 

drivers/gpu/drm/amd/pm/powerplay/smumgr/fiji_smumgr.c

@@ -332,7 +332,7 @@ static bool fiji_is_hw_avfs_present(struct pp_hwmgr *hwmgr)
 
 static int fiji_smu_init(struct pp_hwmgr *hwmgr)
 {
-	struct fiji_smumgr *fiji_priv = NULL;
+	struct fiji_smumgr *fiji_priv;
 
 	fiji_priv = kzalloc(sizeof(struct fiji_smumgr), GFP_KERNEL);
 

drivers/gpu/drm/amd/pm/powerplay/smumgr/iceland_smumgr.c

@@ -259,7 +259,7 @@ static int iceland_start_smu(struct pp_hwmgr *hwmgr)
 
 static int iceland_smu_init(struct pp_hwmgr *hwmgr)
 {
-	struct iceland_smumgr *iceland_priv = NULL;
+	struct iceland_smumgr *iceland_priv;
 
 	iceland_priv = kzalloc(sizeof(struct iceland_smumgr), GFP_KERNEL);
 

drivers/gpu/drm/amd/pm/powerplay/smumgr/tonga_smumgr.c

@@ -226,7 +226,7 @@ static int tonga_start_smu(struct pp_hwmgr *hwmgr)
 
 static int tonga_smu_init(struct pp_hwmgr *hwmgr)
 {
-	struct tonga_smumgr *tonga_priv = NULL;
+	struct tonga_smumgr *tonga_priv;
 
 	tonga_priv = kzalloc(sizeof(struct tonga_smumgr), GFP_KERNEL);
 	if (tonga_priv == NULL)