Fixed issue #4792: Prevent a segfault in _tkinter by using the
guaranteed to be safe interp argument given to the PythonCmd in place
of the Tcl interpreter taken from a PythonCmd_ClientData.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index d0d29ea..4056bcd 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -2070,7 +2070,7 @@
 		return PythonCmd_Error(interp);
 	}
 	else {
-		Tcl_SetObjResult(Tkapp_Interp(self), obj_res);
+		Tcl_SetObjResult(interp, obj_res);
 		rv = TCL_OK;
 	}