refactor(legacy): fix empty parameter list warnings

[no changelog]

legacy/buttons.c

@@ -25,7 +25,7 @@ struct buttonState button;
 uint16_t buttonRead(void) { return gpio_port_read(BTN_PORT); }
 #endif
 
-void buttonUpdate() {
+void buttonUpdate(void) {
   static uint16_t last_state = BTN_PIN_YES | BTN_PIN_NO;
 
   uint16_t state = buttonRead();

legacy/common.c

@@ -96,7 +96,7 @@ void hal_delay(uint32_t ms) {
 #endif
 }
 
-void drbg_init() {
+void drbg_init(void) {
   uint8_t entropy[48] = {0};
   random_buffer(entropy, sizeof(entropy));
   hmac_drbg_init(&drbg_ctx, entropy, sizeof(entropy), NULL, 0);

legacy/firmware/config.c

@@ -979,7 +979,7 @@ void config_setU2FCounter(uint32_t u2fcounter) {
   storage_set_counter(KEY_U2F_COUNTER, u2fcounter);
 }
 
-uint32_t config_getAutoLockDelayMs() {
+uint32_t config_getAutoLockDelayMs(void) {
   if (sectrue == autoLockDelayMsCached) {
     return autoLockDelayMs;
   }

legacy/firmware/fsm_msg_common.h

@@ -538,7 +538,7 @@ void fsm_msgSetU2FCounter(const SetU2FCounter *msg) {
   layoutHome();
 }
 
-void fsm_msgGetNextU2FCounter() {
+void fsm_msgGetNextU2FCounter(void) {
   CHECK_PIN
 
   layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,

legacy/firmware/stellar.c

@@ -1349,7 +1349,7 @@ void stellar_fillSignedTx(StellarSignedTx *resp) {
   resp->signature.size = sizeof(signature);
 }
 
-bool stellar_allOperationsConfirmed() {
+bool stellar_allOperationsConfirmed(void) {
   return stellar_activeTx.confirmed_operations ==
          stellar_activeTx.num_operations;
 }

legacy/oled.c

@@ -177,9 +177,9 @@ void oledInit() {
 /*
  * Clears the display buffer (sets all pixels to black)
  */
-void oledClear() { memzero(_oledbuffer, sizeof(_oledbuffer)); }
+void oledClear(void) { memzero(_oledbuffer, sizeof(_oledbuffer)); }
 
-void oledInvertDebugLink() {
+void oledInvertDebugLink(void) {
 #if DEBUG_LINK
   oledInvertPixel(OLED_WIDTH - 5, 0);
   oledInvertPixel(OLED_WIDTH - 4, 0);
@@ -229,7 +229,7 @@ void oledRefresh() {
 }
 #endif
 
-const uint8_t *oledGetBuffer() { return _oledbuffer; }
+const uint8_t *oledGetBuffer(void) { return _oledbuffer; }
 
 void oledSetBuffer(uint8_t *buf) {
   memcpy(_oledbuffer, buf, sizeof(_oledbuffer));