internal/singleflight: fix duplicate deleting key when ForgetUnshared called
A key may be forgotten while the call is still in flight. So when the
call finished, it should only delete the key if that key is associated
with the call. Otherwise, we may remove the wrong newly created call.
Fixes #55343
Change-Id: I4fa72d79cad006e5884e42d885d193641ef84e0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/433315 Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>