testing/fstest: fix typo in error message

[DrGo]

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This PR (HEAD: 03f96e3) has been imported to Gerrit for code review.

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Patch Set 1:

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Message from Ian Lance Taylor:

Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 2: Run-TryBot+1

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Message from Go Bot:

Patch Set 2:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=37defa3d

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Message from Go Bot:

Patch Set 2: TryBot-Result+1

TryBots are happy.

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Message from Ian Lance Taylor:

Patch Set 2: Code-Review+2

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Message from Tobias Klauser:

Patch Set 3: Run-TryBot+1 Trust+1

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Message from Go Bot:

Patch Set 3:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=d287b541

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Message from Go Bot:

Patch Set 3: TryBot-Result+1

TryBots are happy.

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Message from Tobias Klauser:

Patch Set 3: Code-Review+2

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This PR is being closed because golang.org/cl/280953 has been merged.