Merge branch 'dl/branch-cleanup' into master

Last minute fix-up to tests for portability.

* dl/branch-cleanup:
  t3200: don't grep for `strerror()` string

Author: gitster

t/t3200-branch.sh

@@ -870,7 +870,7 @@ test_expect_success '--set-upstream-to fails on locked config' '
 	>.git/config.lock &&
 	git branch locked &&
 	test_must_fail git branch --set-upstream-to locked 2>err &&
-	test_i18ngrep "could not lock config file .git/config: File exists" err
+	test_i18ngrep "could not lock config file .git/config" err
 '
 
 test_expect_success 'use --set-upstream-to modify HEAD' '
@@ -901,7 +901,7 @@ test_expect_success '--unset-upstream should fail if config is locked' '
 	git branch --set-upstream-to locked &&
 	>.git/config.lock &&
 	test_must_fail git branch --unset-upstream 2>err &&
-	test_i18ngrep "could not lock config file .git/config: File exists" err
+	test_i18ngrep "could not lock config file .git/config" err
 '
 
 test_expect_success 'test --unset-upstream on HEAD' '