Add missing failure checks to ast_str_set_va() callers.

Change-Id: I0c2cdcd53727bdc6634095c61294807255bd278f

main/manager.c

@@ -2811,6 +2811,7 @@ AST_THREADSTORAGE(userevent_buf);
  */
 void astman_append(struct mansession *s, const char *fmt, ...)
 {
+	int res;
 	va_list ap;
 	struct ast_str *buf;
 
@@ -2819,8 +2820,11 @@ void astman_append(struct mansession *s, const char *fmt, ...)
 	}
 
 	va_start(ap, fmt);
-	ast_str_set_va(&buf, 0, fmt, ap);
+	res = ast_str_set_va(&buf, 0, fmt, ap);
 	va_end(ap);
+	if (res == AST_DYNSTR_BUILD_FAILED) {
+		return;
+	}
 
 	if (s->f != NULL || s->session->f != NULL) {
 		send_string(s, ast_str_buffer(buf));
@@ -2880,6 +2884,7 @@ void astman_send_error(struct mansession *s, const struct message *m, char *erro
 
 void astman_send_error_va(struct mansession *s, const struct message *m, const char *fmt, ...)
 {
+	int res;
 	va_list ap;
 	struct ast_str *buf;
 	char *msg;
@@ -2889,8 +2894,11 @@ void astman_send_error_va(struct mansession *s, const struct message *m, const c
 	}
 
 	va_start(ap, fmt);
-	ast_str_set_va(&buf, 0, fmt, ap);
+	res = ast_str_set_va(&buf, 0, fmt, ap);
 	va_end(ap);
+	if (res == AST_DYNSTR_BUILD_FAILED) {
+		return;
+	}
 
 	/* astman_append will use the same underlying buffer, so copy the message out
 	 * before sending the response */

main/xmldoc.c

@@ -2646,14 +2646,18 @@ struct ast_xml_xpath_results *__attribute__((format(printf, 1, 2))) ast_xmldoc_q
 	struct documentation_tree *doctree;
 	RAII_VAR(struct ast_str *, xpath_str, ast_str_create(128), ast_free);
 	va_list ap;
+	int res;
 
 	if (!xpath_str) {
 		return NULL;
 	}
 
 	va_start(ap, fmt);
-	ast_str_set_va(&xpath_str, 0, fmt, ap);
+	res = ast_str_set_va(&xpath_str, 0, fmt, ap);
 	va_end(ap);
+	if (res == AST_DYNSTR_BUILD_FAILED) {
+		return NULL;
+	}
 
 	AST_RWLIST_RDLOCK(&xmldoc_tree);
 	AST_LIST_TRAVERSE(&xmldoc_tree, doctree, entry) {