ecr-credential-provider: Fix warning about no region in image ref

[cartermckinnon]

What type of PR is this?
/kind bug

What this PR does / why we need it:

This log line is in the wrong place, should be when region == "" not region != "".

Which issue(s) this PR fixes:

Noticed in #1029

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[cartermckinnon]

@mmerkes PTAL, I think you were the orig author

[cartermckinnon]

CI seems ill lately.

/retest

[kmala]

/lgtm

[kmala]

/triage accepted

[mmerkes]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mmerkes

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[k8s-ci-robot]

@cartermckinnon: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cloud-provider-aws-check	d6fad2f	link	true	/test pull-cloud-provider-aws-check

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

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