Fixed the discovery of a prior finished hard-link when the entry

is old enough that it is no longer in the flist data.

hlink.c

@@ -249,17 +249,13 @@ static char *check_prior(struct file_struct *file, int gnum,
 			 int *prev_ndx_p, struct file_list **flist_p)
 {
 	struct file_struct *fp;
-	struct file_list *flist;
 	struct ht_int32_node *node;
 	int prev_ndx = F_HL_PREV(file);
 
 	while (1) {
-		if (prev_ndx < 0) {
-			*prev_ndx_p = prev_ndx;
-			*flist_p = NULL;
-			return NULL;
-		}
-		if ((flist = flist_for_ndx(prev_ndx)) == NULL)
+		struct file_list *flist;
+		if (prev_ndx < 0
+		 || (flist = flist_for_ndx(prev_ndx)) == NULL)
 			break;
 		fp = flist->files[prev_ndx - flist->ndx_start];
 		if (!(fp->flags & FLAG_SKIP_HLINK)) {
@@ -270,20 +266,20 @@ static char *check_prior(struct file_struct *file, int gnum,
 		F_HL_PREV(file) = prev_ndx = F_HL_PREV(fp);
 	}
 
-	node = hashtable_find(prior_hlinks, gnum, 0);
-	assert(node != NULL && node->data);
-
-	if (CVAL(node->data, 0) == 0) {
+	if ((node = hashtable_find(prior_hlinks, gnum, 0)) != NULL) {
+		assert(node->data != NULL);
+		if (CVAL(node->data, 0) != 0) {
+			*prev_ndx_p = -1;
+			*flist_p = NULL;
+			return node->data;
+		}
 		/* The prior file must have been skipped. */
-		F_HL_PREV(file) = prev_ndx = -1;
-		*prev_ndx_p = prev_ndx;
-		*flist_p = NULL;
-		return NULL;
+		F_HL_PREV(file) = -1;
 	}
 
-	*prev_ndx_p = prev_ndx;
-	*flist_p = flist;
-	return node->data;
+	*prev_ndx_p = -1;
+	*flist_p = NULL;
+	return NULL;
 }
 
 /* Only called if FLAG_HLINKED is set and FLAG_HLINK_FIRST is not.  Returns: