Windows fixes.

lib/mosquitto.c

@@ -1184,9 +1184,10 @@ bool mosquitto_want_write(struct mosquitto *mosq)
 
 int mosquitto_opts_set(struct mosquitto *mosq, enum mosq_opt_t option, void *value)
 {
-	if(!mosq || !value) return MOSQ_ERR_INVAL;
 	int ival;
 
+	if(!mosq || !value) return MOSQ_ERR_INVAL;
+
 	switch(option){
 		case MOSQ_OPT_PROTOCOL_VERSION:
 			ival = *((int *)value);

src/mosquitto.c

@@ -194,10 +194,10 @@ int main(int argc, char *argv[])
 	FILE *pid;
 	int listener_max;
 	int rc;
-	char err[256];
 #ifdef WIN32
 	SYSTEMTIME st;
 #else
+	char err[256];
 	struct timeval tv;
 #endif
 	struct mosquitto *ctxt, *ctxt_tmp;