msgbuf: s_assert is not a substitute for proper code

(dns, m_alias, m_stats updated as msgbuf no longer includes s_assert.h)

modules/m_alias.c

@@ -31,6 +31,7 @@
 #include "numeric.h"
 #include "send.h"
 #include "packet.h"
+#include "s_assert.h"
 
 static const char alias_desc[] = "Provides the system for services aliases";
 

modules/m_stats.c

@@ -46,6 +46,7 @@
 #include "whowas.h"
 #include "rb_radixtree.h"
 #include "sslproc.h"
+#include "s_assert.h"
 
 static const char stats_desc[] =
 	"Provides the STATS command to inspect various server/network information";