Fixed _bsddb key allocation errors.
diff --git a/Modules/_bsddb.c b/Modules/_bsddb.c
index 3a67a1e..9e31029 100644
--- a/Modules/_bsddb.c
+++ b/Modules/_bsddb.c
@@ -312,6 +312,10 @@
                         "Py_buffer malloc failed");
         return NULL;
     }
+
+    if (PyObject_GetBuffer(obj, view, PyBUF_SIMPLE))
+        return NULL;
+
     if (view->ndim > 1) {
         PyErr_SetString(PyExc_BufferError,
                         "buffers must be single dimension");