Fix compiler warning

diff --git a/src/math/merge.c b/src/math/merge.c
index 45ae60706255d0f359f350d7f89f67e9c152bc64..b5745ceeea062f21ad061882814101df8d497ab8 100644 (file)
--- a/src/math/merge.c
+++ b/src/math/merge.c
@@ -86,7 +86,7 @@ merge_append (struct merge *m, struct casereader *r)
 struct casereader *
 merge_make_reader (struct merge *m)
 {
-  struct casereader *r;
+  struct casereader *r = NULL;
 
   if (m->input_cnt > 1)
     do_merge (m);