Don't try connecting users if the ISpoof is locked

This fixes various issues with slow connecting users. E.g. the users caused
themselves to be added to the ConnectThrottle map even though they didn't
actually try to connect.

Signed-off-by: Uli Schlachter <psychon@znc.in>

znc.cpp

@@ -1989,6 +1989,11 @@ protected:
 		const map<CString,CUser*>& mUsers = CZNC::Get().GetUserMap();
 		map<CString,CUser*>::const_iterator it = mUsers.begin();
 
+		if (CZNC::Get().IsISpoofLocked()) {
+			// Meh, gotta retry later
+			return;
+		}
+
 		uiUserCount = CZNC::Get().GetUserMap().size();
 
 		if (m_uiPosNextUser >= uiUserCount) {