drm/msm: Use of_get_available_child_by_name()

Simplify zap_shader_load_mdt() by using of_get_available_child_by_name().

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Patchwork: https://patchwork.freedesktop.org/patch/635020/
Link: https://lore.kernel.org/r/20250201155830.39366-1-biju.das.jz@bp.renesas.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Author: bijudas

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

@@ -45,8 +45,8 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
 		return -EINVAL;
 	}
 
-	np = of_get_child_by_name(dev->of_node, "zap-shader");
-	if (!of_device_is_available(np)) {
+	np = of_get_available_child_by_name(dev->of_node, "zap-shader");
+	if (!np) {
 		zap_available = false;
 		return -ENODEV;
 	}