go/printer: nameSize += 1 instead of nameSize = 1

[cuiweixie]

Fixes #78544

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Mateusz Poliwczak:

Patch Set 2:

(1 comment)

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Message from xie cui:

Patch Set 3: Commit-Queue+1

(2 comments)

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Message from Go LUCI:

Patch Set 3:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2026-04-07T05:23:02Z","revision":"fbacf5c651a865d892bb647efad527a9de0fe116"}

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Message from xie cui:

Patch Set 3: -Commit-Queue

(Performed by <GERRIT_ACCOUNT_60063> on behalf of <GERRIT_ACCOUNT_37653>)

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Message from Go LUCI:

Patch Set 3:

This CL has passed the run

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Message from Go LUCI:

Patch Set 3: LUCI-TryBot-Result+1

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Message from Mateusz Poliwczak:

Patch Set 3:

(1 comment)

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Message from xie cui:

Patch Set 4:

(1 comment)

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Message from Mateusz Poliwczak:

Patch Set 4:

(1 comment)

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Message from xie cui:

Patch Set 5:

(1 comment)

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