Fix hdrContains() return value on error

diff --git a/python/header-py.c b/python/header-py.c
index 57eb74b..9203156 100644 (file)
--- a/python/header-py.c
+++ b/python/header-py.c
@@ -247,7 +247,7 @@ static PyObject *hdrIsSource(hdrObject *s)
 static int hdrContains(hdrObject *s, PyObject *pytag)
 {
     rpmTag tag;
-    if (!tagNumFromPyObject(pytag, &tag)) return NULL;
+    if (!tagNumFromPyObject(pytag, &tag)) return -1;
 
     return headerIsEntry(s->h, tag);
 }