chan_dahdi.c: crash in chan_dahdi

Fixes a crash in chan_dahdi occurring on 32-bit systems. A previous
patch introduced a variable of type unassigned long long which is 64-bits.
Casting it as 'ast_json_int_t' along with JSON type 'I' makes it work
with 32-bit systems.

ASTERISK-28457

Change-Id: I9cef6b5f2d826fc5c93f2f6a1c997c4e3e6c93fe

channels/chan_dahdi.c

@@ -1766,8 +1766,8 @@ static void publish_dahdichannel(struct ast_channel *chan, ast_group_t group, in
 
 	ast_assert(dahdi_channel != NULL);
 
-	blob = ast_json_pack("{s: i, s: i, s: s}",
-		"group", group,
+	blob = ast_json_pack("{s: I, s: i, s: s}",
+		"group", (ast_json_int_t)group,
 		"span", span,
 		"channel", dahdi_channel);
 	if (!blob) {