gofmt crypto/bn/check_bn_tests.go.

Some gerrit git hook says this is necessary.

Change-Id: I8a7a0a0e6732688c965b43824fe54b2db79a4919
Reviewed-on: https://boringssl-review.googlesource.com/8990
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/crypto/bn/check_bn_tests.go b/crypto/bn/check_bn_tests.go
index 68e79e0..9a1b65e 100644
--- a/crypto/bn/check_bn_tests.go
+++ b/crypto/bn/check_bn_tests.go
@@ -238,7 +238,7 @@
 				r = r.Mod(r, test.Values["P"])
 				checkResult(test, "ModSqrt ^ 2 (mod P)", "A", r)
 
-				if (test.Values["P"].Cmp(bigTwo) > 0) {
+				if test.Values["P"].Cmp(bigTwo) > 0 {
 					pMinus1Over2 := new(big.Int).Sub(test.Values["P"], bigOne)
 					pMinus1Over2.Rsh(pMinus1Over2, 1)