service/ec2: VolumeAvailableWaiter.Wait() doesn't seem to work as expected

[shaftoe]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone though the API reference
• I've checked AWS Forums and StackOverflow for answers
• I've searched for previous similar issues and didn't find any solution

Describe the bug

The waiter returns a timeout error even if the volume has been in available state for long (>4.5 minutes) in dry run mode, otherwise it errors with waiter comparator expected []string value got []interface {}

Version of AWS SDK for Go?

v1.0.0

Version of Go (go version)?

go version go1.15.7 darwin/amd64

To Reproduce (observed behavior)

To reproduce, go run -> https://gist.github.com/shaftoe/8177edf8cc72d132c9e510f813ea83a2

If DryRun is set to false, it fails with Waiter error: waiter comparator expected []string value got []interface {}

Expected behavior

The waiter returns nil soon after the volume is in available state

[github-actions]

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