drm/radeon: Remove unnecessary NULL values

The NULL initialization of the pointers assigned by kzalloc() first is
not necessary, because if the kzalloc() failed, the pointers will be
assigned NULL, otherwise it works as usual. so remove it.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_agp.c

@@ -130,7 +130,7 @@ static struct radeon_agpmode_quirk radeon_agpmode_quirk_list[] = {
 struct radeon_agp_head *radeon_agp_head_init(struct drm_device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
-	struct radeon_agp_head *head = NULL;
+	struct radeon_agp_head *head;
 
 	head = kzalloc(sizeof(*head), GFP_KERNEL);
 	if (!head)

drivers/gpu/drm/radeon/radeon_combios.c

@@ -863,7 +863,7 @@ struct radeon_encoder_primary_dac *radeon_combios_get_primary_dac_info(struct
 	struct radeon_device *rdev = dev->dev_private;
 	uint16_t dac_info;
 	uint8_t rev, bg, dac;
-	struct radeon_encoder_primary_dac *p_dac = NULL;
+	struct radeon_encoder_primary_dac *p_dac;
 	int found = 0;
 
 	p_dac = kzalloc(sizeof(struct radeon_encoder_primary_dac),
@@ -1014,7 +1014,7 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct
 	struct radeon_device *rdev = dev->dev_private;
 	uint16_t dac_info;
 	uint8_t rev, bg, dac;
-	struct radeon_encoder_tv_dac *tv_dac = NULL;
+	struct radeon_encoder_tv_dac *tv_dac;
 	int found = 0;
 
 	tv_dac = kzalloc(sizeof(struct radeon_encoder_tv_dac), GFP_KERNEL);
@@ -1100,7 +1100,7 @@ static struct radeon_encoder_lvds *radeon_legacy_get_lvds_info_from_regs(struct
 									 radeon_device
 									 *rdev)
 {
-	struct radeon_encoder_lvds *lvds = NULL;
+	struct radeon_encoder_lvds *lvds;
 	uint32_t fp_vert_stretch, fp_horz_stretch;
 	uint32_t ppll_div_sel, ppll_val;
 	uint32_t lvds_ss_gen_cntl = RREG32(RADEON_LVDS_SS_GEN_CNTL);

drivers/gpu/drm/radeon/radeon_legacy_encoders.c

@@ -1692,7 +1692,7 @@ static struct radeon_encoder_int_tmds *radeon_legacy_get_tmds_info(struct radeon
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct radeon_device *rdev = dev->dev_private;
-	struct radeon_encoder_int_tmds *tmds = NULL;
+	struct radeon_encoder_int_tmds *tmds;
 	bool ret;
 
 	tmds = kzalloc(sizeof(struct radeon_encoder_int_tmds), GFP_KERNEL);
@@ -1715,7 +1715,7 @@ static struct radeon_encoder_ext_tmds *radeon_legacy_get_ext_tmds_info(struct ra
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct radeon_device *rdev = dev->dev_private;
-	struct radeon_encoder_ext_tmds *tmds = NULL;
+	struct radeon_encoder_ext_tmds *tmds;
 	bool ret;
 
 	if (rdev->is_atom_bios)