cmd/vet/all: fix whitelist for CL 108557

Change-Id: I831775db5de92d211495acc012fc4366c7c84851
Reviewed-on: https://go-review.googlesource.com/109335
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/vet/all/whitelist/all.txt

@@ -27,7 +27,6 @@ encoding/json/decode_test.go: struct field m2 has json tag but is not exported
 encoding/json/tagkey_test.go: struct field tag `:"BadFormat"` not compatible with reflect.StructTag.Get: bad syntax for struct tag key
 runtime/testdata/testprog/deadlock.go: unreachable code
 runtime/testdata/testprog/deadlock.go: unreachable code
-sync/cond_test.go: assignment copies lock value to c2: sync.Cond contains sync.noCopy
 
 // Non-standard method signatures.
 // These cases are basically ok.