binman: Fix up removal of temporary directories

At present 'make check' leaves some temporary directories around. Part of
this is because we call tools.PrepareOutputDir() twice in some cases,
without calling tools.FinaliseOutputDir() in between.

Fix this.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/entry_test.py

@@ -14,9 +14,14 @@ import fdt_util
 import tools
 
 class TestEntry(unittest.TestCase):
+    def setUp(self):
+        tools.PrepareOutputDir(None)
+
+    def tearDown(self):
+        tools.FinaliseOutputDir()
+
     def GetNode(self):
         binman_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
-        tools.PrepareOutputDir(None)
         fname = fdt_util.EnsureCompiled(
             os.path.join(binman_dir,('test/05_simple.dts')))
         dtb = fdt.FdtScan(fname)
@@ -35,7 +40,6 @@ class TestEntry(unittest.TestCase):
         global entry
         reload(entry)
         entry.Entry.Create(None, self.GetNode(), 'u-boot-spl')
-        tools._RemoveOutputDir()
         del entry
 
     def testEntryContents(self):