chan_gtalk: Fix use of uninitialized vars in config handling.

Fix potential use of context, parkinglot, and prefs before they are
initialized.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@359534 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_gtalk.c

@@ -2077,12 +2077,12 @@ static int gtalk_load_config(void)
 {
 	char *cat = NULL;
 	struct ast_config *cfg = NULL;
-	char context[AST_MAX_CONTEXT];
-	char parkinglot[AST_MAX_CONTEXT];
+	char context[AST_MAX_CONTEXT] = "";
+	char parkinglot[AST_MAX_CONTEXT] = "";
 	int allowguest = 1;
 	struct ast_variable *var;
 	struct gtalk *member;
-	struct ast_codec_pref prefs;
+	struct ast_codec_pref prefs = { "", };
 	struct aji_client_container *clients;
 	struct gtalk_candidate *global_candidates = NULL;
 	struct hostent *hp;