lcd4l: fix -Wformat-truncation warning

src/driver/lcd4l.cpp

@@ -1222,7 +1222,7 @@ void CLCD4l::strReplace(std::string &orig, const std::string &fstr, const std::s
 
 std::string CLCD4l::hexStr(unsigned char data)
 {
-	char hexstr[3];
+	char hexstr[4];
 	snprintf(hexstr, sizeof hexstr, "%02x", (int)data * 255 / 100);
 	return std::string(hexstr);
 }

src/driver/lcd4l.h

@@ -117,7 +117,7 @@ class CLCD4l
 		std::string	m_Info1;
 		std::string	m_Info2;
 		int		m_Progress;
-		char		m_Duration[15];
+		char		m_Duration[24];
 		std::string	m_Start;
 		std::string	m_End;