io_uring: remove redundant assignment to ret in io_register_iowq_max_workers()

After the assignment, only exit path with label 'err' uses ret as
return value. However,before exiting through this path with label 'err',
ret is assigned with the return value of io_wq_max_workers(). Hence, the
initial assignment is redundant and can be removed.
Signed-off-by: NNghia Le <nghialm78@gmail.com>
Link: https://lore.kernel.org/r/20211102190521.28291-1-nghialm78@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -10794,7 +10794,6 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
 	memcpy(ctx->iowq_limits, new_count, sizeof(new_count));
 	ctx->iowq_limits_set = true;
 
-	ret = -EINVAL;
 	if (tctx && tctx->io_wq) {
 		ret = io_wq_max_workers(tctx->io_wq, new_count);
 		if (ret)