Fix a memory leak in the C tracer. Thanks to Yann Malet for reporting it.

Author: nedbat

CHANGES.txt

@@ -5,6 +5,8 @@ Change history for Coverage.py
 Version 3.2b3
 -------------
 
+- Fixed a memory leak in the C tracer that was introduced in 3.2b1.
+
 - The table of contents in the HTML report is now sortable.  Thanks,
   `Chris Adams`_.
 

coverage/tracer.c

@@ -388,7 +388,9 @@ Tracer_trace(Tracer *self, PyFrameObject *frame, int what, PyObject *arg)
                 }
                 else {
                     /* Tracing lines: key is simply this_line. */
-                    PyDict_SetItem(self->cur_file_data, MyInt_FromLong(frame->f_lineno), Py_None);
+                    PyObject * this_line = MyInt_FromLong(frame->f_lineno);
+                    PyDict_SetItem(self->cur_file_data, this_line, Py_None);
+                    Py_DECREF(this_line);
                 }
             }
             self->last_line = frame->f_lineno;