ims_auth: declare extern the stats variables in header file

src/modules/ims_auth/ims_auth_mod.c

@@ -62,6 +62,10 @@
 
 MODULE_VERSION
 
+stat_var* stat_mar_timeouts = NULL;
+stat_var* mar_replies_received = NULL;
+stat_var* mar_replies_response_time = NULL;
+
 static void destroy(void);
 static int mod_init(void);
 

src/modules/ims_auth/stats.h

@@ -47,9 +47,9 @@
 #include "../../core/counters.h"
 #include "ims_auth_mod.h"
 
-stat_var* stat_mar_timeouts;
-stat_var* mar_replies_received;
-stat_var* mar_replies_response_time;
+extern stat_var* stat_mar_timeouts;
+extern stat_var* mar_replies_received;
+extern stat_var* mar_replies_response_time;
 
 int register_stats();
 unsigned long get_avg_mar_response_time();