ASoC: tas2781: Fix a warning reported by robot kernel test

Fix a warning reported by robot kernel test that 'fw_entry' in function
'tas2781_load_calibration' is used uninitialized with compiler
sh4-linux-gcc (GCC) 13.2.0, an update of copyright and a correction of the
comments.

Fixes: ef3bcde7 ("ASoc: tas2781: Add tas2781 driver")
Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://lore.kernel.org/r/20240505122346.1326-1-shenghao-ding@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2781-fmwlib.c

 // SPDX-License-Identifier: GPL-2.0
 //
-// tasdevice-fmw.c -- TASDEVICE firmware support
+// tas2781-fmwlib.c -- TASDEVICE firmware support
 //
-// Copyright 2023 Texas Instruments, Inc.
+// Copyright 2023 - 2024 Texas Instruments, Inc.
 //
 // Author: Shenghao Ding <shenghao-ding@ti.com>
 
@@ -1878,7 +1878,7 @@ int tas2781_load_calibration(void *context, char *file_name,
 {
 	struct tasdevice_priv *tas_priv = (struct tasdevice_priv *)context;
 	struct tasdevice *tasdev = &(tas_priv->tasdevice[i]);
-	const struct firmware *fw_entry;
+	const struct firmware *fw_entry = NULL;
 	struct tasdevice_fw *tas_fmw;
 	struct firmware fmw;
 	int offset = 0;