drm/msm/mdp5: Remove set but not used variable 'hw_cfg' in blend_setup

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c: In function blend_setup:
drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c:225:28: warning: variable hw_cfg set but not used [-Wunused-but-set-variable]

It is not used since commit 14be3200 ("drm/msm: rename mdp->disp")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1570690506-83287-3-git-send-email-zhengbin13@huawei.com

drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c

@@ -214,7 +214,6 @@ static void blend_setup(struct drm_crtc *crtc)
 	struct mdp5_pipeline *pipeline = &mdp5_cstate->pipeline;
 	struct mdp5_kms *mdp5_kms = get_kms(crtc);
 	struct drm_plane *plane;
-	const struct mdp5_cfg_hw *hw_cfg;
 	struct mdp5_plane_state *pstate, *pstates[STAGE_MAX + 1] = {NULL};
 	const struct mdp_format *format;
 	struct mdp5_hw_mixer *mixer = pipeline->mixer;
@@ -232,8 +231,6 @@ static void blend_setup(struct drm_crtc *crtc)
 	u32 val;
 #define blender(stage)	((stage) - STAGE0)
 
-	hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);
-
 	spin_lock_irqsave(&mdp5_crtc->lm_lock, flags);
 
 	/* ctl could be released already when we are shutting down: */