Fix used-uninitialised warning in new.c

Fix a used-uninitialised warning in new.c by having the check_folders()
routine return first=last=NULL for empty folder lists. This is a more
sensible API anyway. (It would not actually have been possible for
the code to try to use last while it was uninitialised, as it happens.)

Signed-off-by: Peter Maydell <pmaydell@chiark.greenend.org.uk>

diff --git a/uip/new.c b/uip/new.c
index 254950b..99d8528 100644 (file)
--- a/uip/new.c
+++ b/uip/new.c
@@ -218,6 +218,8 @@ crawl_callback(char *folder, void *baton)
  * `cur' points to the name of the current folder, `folders' points to the
  * name of a .folder (if NULL, crawl all folders), and `sequences' points to
  * the array of sequences for which to look.
+ *
+ * An empty list is returned as first=last=NULL.
  */
 static void
 check_folders(struct node **first, struct node **last,
@@ -229,7 +231,7 @@ check_folders(struct node **first, struct node **last,
     char *line;
     size_t len;
 
-    *first = *cur_node = NULL;
+    *first = *last = *cur_node = NULL;
     *maxlen = 0;
 
     b.first = first;