cmd/vet: improve detecting printf-like format argument
Previously format argument was detected via scanning func type args. This didn't work when func type couldn't be determined if the func is declared in the external package. Fall back to scanning for the first string call argument in this case. Fixes #14754 Change-Id: I571cc29684cc641bc87882002ef474cf1481e9e2 Reviewed-on: https://go-review.googlesource.com/21023 Run-TryBot: Rob Pike <r@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Rob Pike <r@golang.org>
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