sweet: fix common.Go.Do call

CL 453502 changed the signature of Do, but this call site didn't get
updated.

Change-Id: I23223b45ecc27d7fe9fac589977cf3b5e2204d29
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/457395
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Michael Pratt <mpratt@google.com>
1 file changed