MAINT Fix a few lgtm lints. 
diff --git a/build/pandas-1.0.5/pandas/_libs/src/ujson/python/ujson.c b/build/pandas-1.0.5/pandas/_libs/src/ujson/python/ujson.c
index 4a88fb7..1c87498 100644
--- a/pandas/_libs/src/ujson/python/ujson.c
+++ b/pandas/_libs/src/ujson/python/ujson.c
@@ -41,7 +41,7 @@ http://www.opensource.apple.com/source/tcl/tcl-14/tcl/license.terms
 
 /* objToJSON */
 PyObject *objToJSON(PyObject *self, PyObject *args, PyObject *kwargs);
-void initObjToJSON(void);
+void *initObjToJSON(void);
 
 /* JSONToObj */
 PyObject *JSONToObj(PyObject *self, PyObject *args, PyObject *kwargs);

diff --git a/build/pandas-1.0.5/pandas/_libs/src/ujson/python/ujson.c b/build/pandas-1.0.5/pandas/_libs/src/ujson/python/ujson.c
index 4a88fb7..1c87498 100644
--- a/pandas/_libs/src/ujson/python/ujson.c
+++ b/pandas/_libs/src/ujson/python/ujson.c
@@ -41,7 +41,7 @@ http://www.opensource.apple.com/source/tcl/tcl-14/tcl/license.terms
 
 /* objToJSON */
 PyObject *objToJSON(PyObject *self, PyObject *args, PyObject *kwargs);
-void initObjToJSON(void);
+void *initObjToJSON(void);
 
 /* JSONToObj */
 PyObject *JSONToObj(PyObject *self, PyObject *args, PyObject *kwargs);
