drm/msm: remove unused variable

A cleanup left behind an unused variable that we have to remove
in order to avoid this harmless warning:

drivers/gpu/drm/msm/adreno/a5xx_gpu.c: In function 'a5xx_zap_shader_init':
drivers/gpu/drm/msm/adreno/a5xx_gpu.c:493:19: error: unused variable 'a5xx_gpu' [-Werror=unused-variable]

Fixes: 8d6f0827 ("drm/msm: Remove uneeded platform dev members")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

@@ -358,7 +358,6 @@ static int a5xx_zap_shader_init(struct msm_gpu *gpu)
 {
 	static bool loaded;
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
-	struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
 	struct platform_device *pdev = gpu->pdev;
 	int ret;