Fixed a bug in match_hard_links() where an empty directory would try

to allocate 0 bytes of memory (which can fail on some OSes).

NEWS

@@ -4,6 +4,9 @@ Changes since 3.0.3:
 
   BUG FIXES:
 
+    - Fixed a bug in the hard-linking code where it would sometimes try to
+      allocate 0 bytes of memory (which fails on system OSes).
+
     - Changed the way --progress overwrites its prior output in order to make
       it nearly impossible for the progress to get overwritten by an error.
 

hlink.c

@@ -184,7 +184,7 @@ static void match_gnums(int32 *ndx_list, int ndx_count)
  * to first when we're done. */
 void match_hard_links(struct file_list *flist)
 {
-	if (!list_only) {
+	if (!list_only && flist->used) {
 		int i, ndx_count = 0;
 		int32 *ndx_list;