Solaris doesn't like NULL going to ast_log

Solaris will crash if NULL is passed to ast_log. This simple patch simply uses S_OR to
get around this.

(closes issue #15392)
Reported by: yrashk


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@229498 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -1893,22 +1893,23 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
 		}
 	} else {	/* not found anywhere, see what happened */
 		ast_unlock_contexts();
+		/* Using S_OR here because Solaris doesn't like NULL being passed to ast_log */
 		switch (q.status) {
 		case STATUS_NO_CONTEXT:
 			if (!matching_action)
-				ast_log(LOG_NOTICE, "Cannot find extension context '%s'\n", context);
+				ast_log(LOG_NOTICE, "Cannot find extension context '%s'\n", S_OR(context, ""));
 			break;
 		case STATUS_NO_EXTENSION:
 			if (!matching_action)
-				ast_log(LOG_NOTICE, "Cannot find extension '%s' in context '%s'\n", exten, context);
+				ast_log(LOG_NOTICE, "Cannot find extension '%s' in context '%s'\n", exten, S_OR(context, ""));
 			break;
 		case STATUS_NO_PRIORITY:
 			if (!matching_action)
-				ast_log(LOG_NOTICE, "No such priority %d in extension '%s' in context '%s'\n", priority, exten, context);
+				ast_log(LOG_NOTICE, "No such priority %d in extension '%s' in context '%s'\n", priority, exten, S_OR(context, ""));
 			break;
 		case STATUS_NO_LABEL:
 			if (context)
-				ast_log(LOG_NOTICE, "No such label '%s' in extension '%s' in context '%s'\n", label, exten, context);
+				ast_log(LOG_NOTICE, "No such label '%s' in extension '%s' in context '%s'\n", label, exten, S_OR(context, ""));
 			break;
 		default:
 			if (option_debug)