send_stored_logs(): remove an implicit cast warning.

Michael

src/log.c

@@ -216,7 +216,7 @@ send_stored_logs (void)
 
   for (i = 0; (ssize_t)i != vector_length (log_message_storage); ++i)
     {
-      string = vector_getentry (log_message_storage, i, NULL);
+      string = (char *)vector_getentry (log_message_storage, i, NULL);
 
       ptr = strchr (string, ' ') + 1;
       level = atoi (string);