Add more missing PyErr_NoMemory() after failled memory allocs
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index b9dc179..4e6bcbc 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -2050,7 +2050,7 @@
 
 	data = PyMem_NEW(PythonCmd_ClientData, 1);
 	if (!data)
-		return NULL;
+		return PyErr_NoMemory();
 	Py_XINCREF(self);
 	Py_XINCREF(func);
 	data->self = _self;
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 9dea4b5..c6e1a87 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2251,7 +2251,7 @@
 	argvlist = PyMem_NEW(char *, argc+1);
 	if (argvlist == NULL) {
 		PyMem_Free(path);
-		return NULL;
+		return PyErr_NoMemory();
 	}
 	for (i = 0; i < argc; i++) {
 		if (!PyArg_Parse((*getitem)(argv, i), "et",
@@ -2480,7 +2480,7 @@
 	argvlist = PyMem_NEW(char *, argc+1);
 	if (argvlist == NULL) {
 		PyMem_Free(path);
-		return NULL;
+		return PyErr_NoMemory();
 	}
 	for (i = 0; i < argc; i++) {
 		if (!PyArg_Parse((*getitem)(argv, i), "et",
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 6a358da..14318f6 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -6661,7 +6661,7 @@
 	if (pnew->str == NULL) {
 		_Py_ForgetReference((PyObject *)pnew);
 		PyObject_Del(pnew);
-		return NULL;
+		return PyErr_NoMemory();
 	}
 	Py_UNICODE_COPY(pnew->str, tmp->str, n+1);
 	pnew->length = n;