Fix misspellings using 'codespell' tool

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/json.c b/json.c
index cdc3b21..cba370a 100644
--- a/json.c
+++ b/json.c
@@ -84,7 +84,7 @@
 }
 
 /*
- * Valid JSON strings must escape '"' and '/' with a preceeding '/'
+ * Valid JSON strings must escape '"' and '/' with a preceding '/'
  */
 static struct json_value *json_create_value_string(const char *str)
 {