rule-reload: fix possible hangup with SIGUSR2

In some cases the rule reload could hang. The pending USR2 signals will
be recognized even with the <2 check. Also the SCLogWarning shouldn't be
used in the handler (see Warning about SCLog* API above in the code).

src/suricata.c

@@ -293,11 +293,8 @@ static void SignalHandlerSigterm(/*@unused@*/ int sig)
  */
 static void SignalHandlerSigusr2(int sig)
 {
-    if (sigusr2_count < 16) {
+    if (sigusr2_count < 2)
         sigusr2_count++;
-    } else {
-        SCLogWarning(SC_ERR_LIVE_RULE_SWAP, "Too many USR2 signals pending, ignoring new ones!");
-    }
 }
 
 /**