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python/ext/py-source.c: check seek is not negative

--- a/python/ext/py-source.c

+++ b/python/ext/py-source.c

@@ -251,8 +251,15 @@

 {

   uint_t err = 0;

-  uint_t position;

+  int position;

   if (!PyArg_ParseTuple (args, "I", &position)) {

+    return NULL;

+  }

+

+  if (position < 0) {

+    PyErr_Format(PyExc_ValueError,

+        "error when seeking in source: can not seek to negative value %d",

+        position);

     return NULL;

   }