pipeline: fix a potential divizion by zero

If a component doesn't implement .get_attribute(),
pipeline_get_dai_comp_latency() will divide by uninitialised values,
possibly zero. To fix that initialise those fields to 0 and check
that they have been changed to non-zero before division.

Suggested-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/audio/pipeline/pipeline-graph.c

@@ -514,8 +514,8 @@ struct comp_dev *pipeline_get_dai_comp_latency(uint32_t pipeline_id, uint32_t *l
 	while (ipc_sink) {
 		struct comp_buffer *buffer;
 		uint64_t input_data, output_data;
-		struct ipc4_base_module_cfg input_base_cfg;
-		struct ipc4_base_module_cfg output_base_cfg;
+		struct ipc4_base_module_cfg input_base_cfg = {.ibs = 0};
+		struct ipc4_base_module_cfg output_base_cfg = {.obs = 0};
 		int ret;
 
 		/* Calculate pipeline latency */
@@ -530,7 +530,7 @@ struct comp_dev *pipeline_get_dai_comp_latency(uint32_t pipeline_id, uint32_t *l
 		if (ret < 0)
 			return NULL;
 
-		if (input_data && output_data)
+		if (input_data && output_data && input_base_cfg.ibs && output_base_cfg.obs)
 			*latency += input_data / input_base_cfg.ibs -
 				output_data / output_base_cfg.obs;