staging: rtl8188eu: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break statements instead
of just letting the code fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20210528200650.GA39289@embeddedorSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_mlme_ext.c

@@ -3378,6 +3378,7 @@ static unsigned int OnAssocRsp(struct adapter *padapter,
 			break;
 		case WLAN_EID_ERP_INFO:
 			ERP_IE_handler(padapter, pIE);
+			break;
 		default:
 			break;
 		}

drivers/staging/rtl8188eu/core/rtw_wlan_util.c

@@ -1029,6 +1029,7 @@ unsigned int is_ap_in_tkip(struct adapter *padapter)
 			case WLAN_EID_RSN:
 				if (!memcmp((pIE->data + 8), RSN_TKIP_CIPHER, 4))
 					return true;
+				break;
 			default:
 				break;
 			}
@@ -1226,6 +1227,7 @@ unsigned char check_assoc_AP(u8 *pframe, uint len)
 			} else {
 				break;
 			}
+			break;
 
 		default:
 			break;