ASoC: SOF: change type char to uint8_t in trace.h

Use uint8_t to replace char in packed ABI structs
to have fixed length for struct.

Signed-off-by: Pan Xiuli <xiuli.pan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200415202816.934-13-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/sof/trace.h

@@ -72,7 +72,7 @@ struct sof_ipc_dma_trace_posn {
 struct sof_ipc_panic_info {
 	struct sof_ipc_hdr hdr;
 	uint32_t code;			/* SOF_IPC_PANIC_ */
-	char filename[SOF_TRACE_FILENAME_SIZE];
+	uint8_t filename[SOF_TRACE_FILENAME_SIZE];
 	uint32_t linenum;
 }  __packed;