ASoC: SOF: sof-client-probes-ipc4: add checks to prevent static analysis warnings

make KCFLAGS='-fanalyzer' sound/soc/sof/ reports several NULL pointer
dereference paths.

sof_ipc4_probe_get_module_info() can return a NULL value, but it's
only tested in the init state. Static analyzers cannot know the probe
state machine and hence flags a potential issue for all calls of that
function.

Squelch these errors by adding the same check consistently.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Yaochun Hung <yc.hung@mediatek.com>
Link: https://lore.kernel.org/r/20230731213748.440285-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-client-probes-ipc4.c

@@ -146,6 +146,9 @@ static int ipc4_probes_deinit(struct sof_client_dev *cdev)
 	struct sof_man4_module *mentry = sof_ipc4_probe_get_module_info(cdev);
 	struct sof_ipc4_msg msg;
 
+	if (!mentry)
+		return -ENODEV;
+
 	msg.primary = mentry->id;
 	msg.primary |= SOF_IPC4_MSG_TYPE_SET(SOF_IPC4_MOD_DELETE_INSTANCE);
 	msg.primary |= SOF_IPC4_MSG_DIR(SOF_IPC4_MSG_REQUEST);
@@ -197,6 +200,9 @@ static int ipc4_probes_points_add(struct sof_client_dev *cdev,
 	struct sof_ipc4_msg msg;
 	int i, ret;
 
+	if (!mentry)
+		return -ENODEV;
+
 	/* The sof_probe_point_desc and sof_ipc4_probe_point structs
 	 * are of same size and even the integers are the same in the
 	 * same order, and similar meaning, but since there is no
@@ -247,6 +253,9 @@ static int ipc4_probes_points_remove(struct sof_client_dev *cdev,
 	u32 *probe_point_ids;
 	int i, ret;
 
+	if (!mentry)
+		return -ENODEV;
+
 	probe_point_ids = kcalloc(num_buffer_id, sizeof(*probe_point_ids),
 				  GFP_KERNEL);
 	if (!probe_point_ids)