clearbufferonmsg: Skip detached chans

Since the user can't read detached channels, there is no point in clearing their
buffer. Let's leave them alone instead.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@2151 726aef4b-f618-498e-8847-2d620e286838

modules/extra/clearbufferonmsg.cpp

@@ -19,6 +19,10 @@ public:
 		vector<CChan*>::const_iterator it;
 
 		for (it = vChans.begin(); it != vChans.end(); ++it) {
+			// Skip detached channels, they weren't read yet
+			if ((*it)->IsDetached())
+				continue;
+
 			(*it)->ClearBuffer();
 			// We force KeepBuffer on all channels since this module
 			// doesnt make any sense without