Quenching fallthrough warnings

src/usbd_stm32f103_devfs.c

@@ -379,6 +379,7 @@ int32_t ep_read(uint8_t ep, void *buf, uint16_t blen) {
         case 0:
         case (USB_EP_DTOG_RX | USB_EP_SWBUF_RX):
             *reg = (*reg & USB_EPREG_MASK) | USB_EP_SWBUF_RX;
+        	break;
         default:
             break;
         }

src/usbd_stm32l052_devfs.c

@@ -302,6 +302,7 @@ int32_t ep_read(uint8_t ep, void *buf, uint16_t blen) {
         case 0:
         case (USB_EP_DTOG_RX | USB_EP_SWBUF_RX):
             *reg = (*reg & USB_EPREG_MASK) | USB_EP_SWBUF_RX;
+        	break;
         default:
             break;
         }

src/usbd_stm32l100_devfs.c

@@ -289,6 +289,7 @@ int32_t ep_read(uint8_t ep, void *buf, uint16_t blen) {
         case 0:
         case (USB_EP_DTOG_RX | USB_EP_SWBUF_RX):
             *reg = (*reg & USB_EPREG_MASK) | USB_EP_SWBUF_RX;
+        	break;
         default:
             break;
         }

src/usbd_stm32l433_devfs.c

@@ -302,6 +302,7 @@ int32_t ep_read(uint8_t ep, void *buf, uint16_t blen) {
         case 0:
         case (USB_EP_DTOG_RX | USB_EP_SWBUF_RX):
             *reg = (*reg & USB_EPREG_MASK) | USB_EP_SWBUF_RX;
+        	break;
         default:
             break;
         }