fix dealloc function

Author: koubaa

Modules/md5module.c

@@ -340,7 +340,7 @@ newMD5object(MD5State * st)
 static void
 MD5_dealloc(PyObject *ptr)
 {
-    PyObject *tp = Py_TYPE(ptr);
+    PyTypeObject *tp = Py_TYPE(ptr);
     PyObject_Del(ptr);
     Py_DECREF(tp);
 }

Modules/sha1module.c

@@ -318,7 +318,7 @@ newSHA1object(SHA1State *st)
 static void
 SHA1_dealloc(PyObject *ptr)
 {
-    PyObject *tp = Py_TYPE(ptr);
+    PyTypeObject *tp = Py_TYPE(ptr);
     PyObject_Del(ptr);
     Py_DECREF(tp);
 }

Modules/sha512module.c

@@ -449,7 +449,7 @@ static SHAobject *newSHA512object(SHA512State *st)
 static void
 SHA512_dealloc(PyObject *ptr)
 {
-    PyObject *tp = Py_TYPE(ptr);
+    PyTypeObject *tp = Py_TYPE(ptr);
     PyObject_Del(ptr);
     Py_DECREF(tp);
 }