misc drivers: small cleanup to class var init

src/mame/drivers/aci_boris.cpp

@@ -66,7 +66,7 @@ private:
 	void digit_w(u8 data);
 	u8 input_r();
 
-	u8 m_io[2] = { 0, 0 };
+	u8 m_io[2] = { };
 	u8 m_4042 = 0;
 };
 

src/mame/drivers/debut.cpp

@@ -99,15 +99,13 @@ private:
 	void latch_w(offs_t offset, u8 data);
 	DECLARE_WRITE_LINE_MEMBER(lcd_update_w);
 
-	u8 m_latch[5];
+	u8 m_latch[5] = { };
 	u8 m_dac_data = 0;
 	u8 m_lcd_update = 0;
 };
 
 void debut_state::machine_start()
 {
-	memset(m_latch, 0, sizeof(m_latch));
-
 	// resolve handlers
 	m_out_digit.resolve();
 

src/mame/drivers/eva.cpp

@@ -81,7 +81,6 @@ protected:
 	virtual void machine_start() override;
 
 private:
-
 	// devices
 	required_device<cop420_cpu_device> m_maincpu;
 

src/mame/drivers/fidel_eag68k.cpp

@@ -198,8 +198,7 @@ public:
 		m_board(*this, "board"),
 		m_display(*this, "display"),
 		m_dac(*this, "dac"),
-		m_inputs(*this, "IN.%u", 0),
-		m_rotate(true)
+		m_inputs(*this, "IN.%u", 0)
 	{ }
 
 	// machine configs
@@ -238,7 +237,7 @@ protected:
 	void leds_w(offs_t offset, u8 data);
 	void digit_w(offs_t offset, u8 data);
 
-	bool m_rotate;
+	bool m_rotate = true;
 	u8 m_select = 0;
 	u8 m_7seg_data = 0;
 	u8 m_led_data = 0;

src/mame/drivers/fidel_elite.cpp

@@ -101,8 +101,7 @@ public:
 		m_speech(*this, "speech"),
 		m_speech_rom(*this, "speech"),
 		m_language(*this, "language"),
-		m_inputs(*this, "IN.%u", 0),
-		m_rotate(false)
+		m_inputs(*this, "IN.%u", 0)
 	{ }
 
 	// machine configs
@@ -143,7 +142,7 @@ protected:
 	u8 ppi_portb_r();
 	void ppi_portc_w(u8 data);
 
-	bool m_rotate;
+	bool m_rotate = false;
 	u8 m_led_data = 0;
 	u8 m_7seg_data = 0;
 	u8 m_inp_mux = 0;

src/mame/drivers/mephisto_mondial2.cpp

@@ -64,7 +64,6 @@ private:
 	u8 m_led_data = 0;
 };
 
-
 void mondial2_state::machine_start()
 {
 	save_item(NAME(m_keypad_mux));

src/mame/drivers/saitek_exchess.cpp

@@ -73,8 +73,8 @@ private:
 	void ram_data_w(u8 data);
 
 	std::unique_ptr<u8[]> m_ram;
-	u8 m_ram_address[2] = { 0, 0 };
-	u64 m_lcd_data[2] = { 0, 0 };
+	u8 m_ram_address[2] = { };
+	u64 m_lcd_data[2] = { };
 };
 
 void exchess_state::machine_start()

src/mame/drivers/saitek_leonardo.cpp

@@ -123,7 +123,7 @@ private:
 	void p6_w(u8 data);
 
 	u8 m_inp_mux = 0;
-	u8 m_led_data[2] = { 0, 0 };
+	u8 m_led_data[2] = { };
 };
 
 void leo_state::machine_start()

src/mame/drivers/saitek_prschess.cpp

@@ -72,7 +72,7 @@ private:
 	u8 input_r();
 
 	u8 m_inp_mux = 0;
-	u8 m_led_data[2] = { 0, 0 };
+	u8 m_led_data[2] = { };
 };
 
 void prschess_state::machine_start()

src/mame/drivers/saitek_renaissance.cpp

@@ -109,7 +109,7 @@ private:
 	void p6_w(u8 data);
 
 	u8 m_inp_mux = 0;
-	u8 m_led_data[2] = { 0, 0 };
+	u8 m_led_data[2] = { };
 };
 
 void ren_state::machine_start()

src/mame/drivers/talkingbb.cpp

@@ -154,10 +154,6 @@ private:
 
 void talkingbb_state::machine_start()
 {
-	// zerofill
-	m_bank = 0;
-	m_inp_mux = 0;
-
 	// register for savestates
 	save_item(NAME(m_bank));
 	save_item(NAME(m_inp_mux));

src/mame/drivers/talkingfb.cpp

@@ -71,10 +71,6 @@ private:
 
 void talkingfb_state::machine_start()
 {
-	// zerofill
-	m_bank = 0;
-	m_inp_mux = 0;
-
 	// register for savestates
 	save_item(NAME(m_bank));
 	save_item(NAME(m_inp_mux));