File cronolog_avoid_empty_filename.patch of Package cronolog

Index: cronolog-1.7.0/src/cronoutils.c
===================================================================
--- cronolog-1.7.0.orig/src/cronoutils.c
+++ cronolog-1.7.0/src/cronoutils.c
@@ -195,11 +195,11 @@ create_link(char *pfilename,
 {
     struct stat    	stat_buf;
     
-    if (lstat(prevlinkname, &stat_buf) == 0)
+    if (prevlinkname && stat(prevlinkname, &stat_buf) == 0)
     {
-    unlink(prevlinkname);
+        unlink(prevlinkname);
     }
-    if (lstat(linkname, &stat_buf) == 0)
+    if (linkname && stat(linkname, &stat_buf) == 0)
     {
     if (prevlinkname) {
         rename(linkname, prevlinkname);