i3c: set default return for i3c_device_adv_info_get()

Coverity flagged that the return variable ret may not be
initialized when returning. So give it a default value.

Fixes #90509

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

drivers/i3c/i3c_common.c

@@ -772,7 +772,7 @@ int i3c_device_adv_info_get(struct i3c_device_desc *target)
 	struct i3c_ccc_mwl mwl = {0};
 	union i3c_ccc_getcaps caps = {0};
 	union i3c_ccc_getmxds mxds = {0};
-	int ret;
+	int ret = -EIO;
 
 	/* GETMRL */
 	if (i3c_ccc_do_getmrl(target, &mrl) != 0) {