res_pjsip: Fix initialization of extended stringfields.

It is possible for initialization of extended stringfields to fail.  Add
checks for this failure.

Change-Id: I062e09852db3d37ceefaf6c2048958fa0118304f

res/res_pjsip/location.c

@@ -118,16 +118,15 @@ static void *contact_alloc(const char *name)
 		return NULL;
 	}
 
-	if (ast_string_field_init(contact, 256)) {
+	if (ast_string_field_init(contact, 256)
+		|| ast_string_field_init_extended(contact, endpoint_name)
+		|| ast_string_field_init_extended(contact, reg_server)
+		|| ast_string_field_init_extended(contact, via_addr)
+		|| ast_string_field_init_extended(contact, call_id)) {
 		ao2_cleanup(contact);
 		return NULL;
 	}
 
-	ast_string_field_init_extended(contact, endpoint_name);
-	ast_string_field_init_extended(contact, reg_server);
-	ast_string_field_init_extended(contact, via_addr);
-	ast_string_field_init_extended(contact, call_id);
-
 	/* Dynamic contacts are delimited with ";@" and static ones with "@@" */
 	if ((aor_separator = strstr(id, ";@")) || (aor_separator = strstr(id, "@@"))) {
 		*aor_separator = '\0';

res/res_pjsip/pjsip_configuration.c

@@ -2197,13 +2197,12 @@ void *ast_sip_endpoint_alloc(const char *name)
 	if (!endpoint) {
 		return NULL;
 	}
-	if (ast_string_field_init(endpoint, 64)) {
+	if (ast_string_field_init(endpoint, 64)
+		|| ast_string_field_init_extended(endpoint, incoming_mwi_mailbox)) {
 		ao2_cleanup(endpoint);
 		return NULL;
 	}
 
-	ast_string_field_init_extended(endpoint, incoming_mwi_mailbox);
-
 	if (!(endpoint->media.codecs = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 		ao2_cleanup(endpoint);
 		return NULL;