audio: host: Add NULL check for local buffer retrieval

Add NULL pointer check after calling `comp_dev_get_first_data_consumer`
and `comp_dev_get_first_data_producer` functions in host_common_params.

These functions can return NULL if no appropriate buffer is found in the
component's connection list. Without this check, a NULL pointer would be
assigned to hd->local_buffer and could cause crashes in subsequent
operations that assume a valid buffer pointer.

The error handling returns -EINVAL and logs an appropriate error message
to help with debugging pipeline configuration issues.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

Author: tmleman

src/audio/host-zephyr.c

@@ -903,6 +903,11 @@ int host_common_params(struct host_data *hd, struct comp_dev *dev,
 	else
 		hd->local_buffer = comp_dev_get_first_data_producer(dev);
 
+	if (!hd->local_buffer) {
+		comp_err(dev, "no local buffer found");
+		return -EINVAL;
+	}
+
 	period_bytes = dev->frames * get_frame_bytes(params->frame_fmt, params->channels);
 
 	if (!period_bytes) {