Wait forever until reconnect, the fallthrough case had us retrying the sql on a closed connection which may have led to a crash.

src/zm_db.cpp

@@ -199,10 +199,11 @@ int zmDbDo(const std::string &query) {
   while ((rc = mysql_query(&dbconn, query.c_str())) and !zm_terminate) {
     if (mysql_ping(&dbconn)) {
       // Was a connection error
-      if (!zmDbReconnect()) {
+      while (!zmDbReconnect() and !zm_terminate) {
         // If we failed. Sleeping 1 sec may be way too much.
         sleep(1);
       }
+      if (zm_terminate) return 0;
     } else {
       // Not a connection error
       Error("Can't run query %s: %s", query.c_str(), mysql_error(&dbconn));