pre_sync now closes file_b if a sync already was in progress.

src/server/simple-cache.c

@@ -1134,7 +1134,12 @@ pre_sync(void)
     }
     else
 	log("pre_sync: datafile not clean. No backup taken.\n");
-    
+
+    if ( file_b != NULL )
+    {
+	log("pre_sync: Save in progress aborted.\n");
+	fclose(file_b);
+    }
 
     if ( (file_b=fopen(datafilename, "wb") ) == NULL )
     {