src/compat_libaio: silence fallthrough cases

Signed-off-by: Jens Axboe <axboe@kernel.dk>

src/compat_libaio.c

diff --git a/src/compat_libaio.c b/src/compat_libaio.c
index 9001509..e105fbf 100644
--- a/src/compat_libaio.c
+++ b/src/compat_libaio.c
@@ -168,6 +168,7 @@
 	switch (iocb->aio_lio_opcode) {
 	case IO_CMD_PREAD:
 		is_write = 0;
+		/* fallthrough */
 	case IO_CMD_PWRITE: {
 		vec->iov_base = iocb->u.c.buf;
 		vec->iov_len = iocb->u.c.nbytes;
@@ -184,6 +185,7 @@
 		}
 	case IO_CMD_FDSYNC:
 		fsync_flags = IORING_FSYNC_DATASYNC;
+		/* fallthrough */
 	case IO_CMD_FSYNC:
 		io_uring_prep_fsync(sqe, iocb->aio_fildes, fsync_flags);
 		break;
@@ -196,6 +198,7 @@
 		return -EINVAL;
 	case IO_CMD_PREADV:
 		is_write = 0;
+		/* fallthrough */
 	case IO_CMD_PWRITEV:
 		if (is_write)
 			io_uring_prep_writev(sqe, iocb->aio_fildes,