Fix compilation warnings

src/main.c

@@ -905,7 +905,7 @@ unsigned char io_event(__attribute__((unused)) unsigned char channel) {
                   SEPROXYHAL_TAG_STATUS_EVENT_FLAG_USB_POWERED)) {
                 THROW(EXCEPTION_IO_RESET);
             }
-            // no break is intentional
+            __attribute__((fallthrough));
         default:
             UX_DEFAULT_EVENT();
             break;

src_nbgl/ui_display_privacy.c

@@ -58,11 +58,11 @@ static void buildFirstPage(void) {
 }
 
 void ui_display_privacy_public_key(void) {
-    review_string = "Provide public\nprivacy key";
+    review_string = (char *) "Provide public\nprivacy key";
     buildFirstPage();
 }
 
 void ui_display_privacy_shared_secret(void) {
-    review_string = "Provide public\nsecret key";
+    review_string = (char *) "Provide public\nsecret key";
     buildFirstPage();
 }

src_nbgl/ui_stark_transfer.c

@@ -105,15 +105,15 @@ void ui_stark_transfer(bool selfTransfer, bool conditional) {
     char *subTitle;
     if (conditional) {
         if (selfTransfer) {
-            subTitle = "Conditionnal self transfer";
+            subTitle = (char *) "Conditionnal self transfer";
         } else {
-            subTitle = "Conditionnal transfer";
+            subTitle = (char *) "Conditionnal transfer";
         }
     } else {
         if (selfTransfer) {
-            subTitle = "self transfer";
+            subTitle = (char *) "self transfer";
         } else {
-            subTitle = "Transfer";
+            subTitle = (char *) "Transfer";
         }
     }
     nbgl_useCaseReviewStart(get_app_icon(false),

src_plugins/eth2/eth2_plugin.c

@@ -212,7 +212,7 @@ void eth2_plugin_call(int message, void *parameters) {
                     strlcpy(msg->title, "Validator", msg->titleLength);
                     strlcpy(msg->msg, context->deposit_address, msg->msgLength);
                     msg->result = ETH_PLUGIN_RESULT_OK;
-                }
+                } break;
                 default:
                     break;
             }