Improve a debug message to be more readable and consistent.

(closes issue #18282)
Reported by: klaus3000
Patches:
      ast_devstate2str-patch.txt uploaded by klaus3000 (license 65)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@294500 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/devicestate.c

@@ -609,7 +609,8 @@ static void process_collection(const char *device, struct change_collection *col
 
 	state = ast_devstate_aggregate_result(&agg);
 
-	ast_debug(1, "Aggregate devstate result is %d\n", state);
+	ast_debug(1, "Aggregate devstate result is '%s' for '%s'\n",
+		ast_devstate2str(state), device);
 
 	event = ast_event_get_cached(AST_EVENT_DEVICE_STATE,
 		AST_EVENT_IE_DEVICE, AST_EVENT_IE_PLTYPE_STR, device,