Fixed segfault when no misdn.conf exists, reported by Igor Neves, thanks.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@47359 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_misdn.c

@@ -4121,8 +4121,11 @@ int load_module(void)
 		return 0;
 	}
 	
-	
-	misdn_cfg_init(max_ports);
+	if (misdn_cfg_init(max_ports)<0) {
+		ast_log(LOG_ERROR, "Unable to initialize mISDN Config System\n");
+		return 0;
+	}
+
 	g_config_initialized=1;
 	
 	misdn_debug = (int *)malloc(sizeof(int) * (max_ports+1));

channels/misdn/chan_misdn_config.h

@@ -85,7 +85,7 @@ enum misdn_cfg_method {
 };
 
 /* you must call misdn_cfg_init before any other function of this header file */
-void misdn_cfg_init(int max_ports); 
+int misdn_cfg_init(int max_ports); 
 void misdn_cfg_reload(void);
 void misdn_cfg_destroy(void);
 

channels/misdn_config.c

@@ -727,7 +727,7 @@ void misdn_cfg_destroy (void)
 	ast_mutex_destroy(&config_mutex);
 }
 
-void misdn_cfg_init (int this_max_ports)
+int misdn_cfg_init (int this_max_ports)
 {
 	char config[] = "misdn.conf";
 	char *cat, *p;
@@ -737,7 +737,7 @@ void misdn_cfg_init (int this_max_ports)
 
 	if (!(cfg = AST_LOAD_CFG(config))) {
 		ast_log(LOG_WARNING,"no misdn.conf ?\n");
-		return;
+		return -1;
 	}
 
 	misdn_cfg_lock();
@@ -783,4 +783,6 @@ void misdn_cfg_init (int this_max_ports)
 
 	misdn_cfg_unlock();
 	AST_DESTROY_CFG(cfg);
+
+	return 0;
 }