drm/msm: 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.
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/551872/
Link: https://lore.kernel.org/r/20230809034445.434902-4-ruanjinjie@huawei.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -1466,7 +1466,7 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
 	struct msm_drm_private *priv = dev->dev_private;
 	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
 	struct drm_crtc *crtc = NULL;
-	struct dpu_crtc *dpu_crtc = NULL;
+	struct dpu_crtc *dpu_crtc;
 	int i, ret;
 
 	dpu_crtc = kzalloc(sizeof(*dpu_crtc), GFP_KERNEL);

drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c

@@ -379,7 +379,7 @@ struct mdp5_smp *mdp5_smp_init(struct mdp5_kms *mdp5_kms, const struct mdp5_smp_
 {
 	struct mdp5_smp_state *state;
 	struct mdp5_global_state *global_state;
-	struct mdp5_smp *smp = NULL;
+	struct mdp5_smp *smp;
 	int ret;
 
 	smp = kzalloc(sizeof(*smp), GFP_KERNEL);