CUser::AddCTCPReply(): Reject CTCP requests containing spaces

CTCP requests can't contain spaces so it's useless to specify rules for those.

This doesn't affect any of the existing callers because those use Token(0) for
generating the first argument to this function.

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

User.cpp

@@ -1253,10 +1253,14 @@ void CUser::SetIRCNick(const CNick& n) {
 }
 
 bool CUser::AddCTCPReply(const CString& sCTCP, const CString& sReply) {
+	// Reject CTCP requests containing spaces
+	if (sCTCP.find_first_of(' ') != CString::npos) {
+		return false;
+	}
+	// Reject empty CTCP requests
 	if (sCTCP.empty()) {
 		return false;
 	}
-
 	m_mssCTCPReplies[sCTCP.AsUpper()] = sReply;
 	return true;
 }