Refactor rtcIsDataChannelOpen to rtcIsOpen

include/rtc/rtc.h

@@ -206,7 +206,7 @@ RTC_EXPORT int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb);
 RTC_EXPORT int rtcCreateDataChannel(int pc, const char *label); // returns dc id
 RTC_EXPORT int rtcCreateDataChannelEx(int pc, const char *label,
                                       const rtcDataChannelInit *init); // returns dc id
-RTC_EXPORT int rtcIsDataChannelOpen(int dc);
+RTC_EXPORT int rtcIsOpen(int dc);
 RTC_EXPORT int rtcDeleteDataChannel(int dc);
 
 RTC_EXPORT int rtcGetDataChannelStream(int dc);

src/capi.cpp

@@ -383,9 +383,9 @@ int rtcCreateDataChannelEx(int pc, const char *label, const rtcDataChannelInit *
 	});
 }
 
-int rtcIsDataChannelOpen(int dc) {
-	return wrap([dc] {
-		return getDataChannel(dc)->isOpen() ? RTC_ERR_SUCCESS : RTC_ERR_FAILURE;
+int rtcIsOpen(int cid) {
+	return wrap([cid] {
+        return getChannel(cid)->isOpen();
 	});
 }