Remove decorator for now-passing test

The underlying issue was actually a Clang bug, now fixed.  The test now
reports XPASS for me locally and on the buildbot.

llvm.org/pr17183 (LLDB)
llvm.org/pr18950 (Clang)

llvm-svn: 206761

Author: emaste

lldb/test/expression_command/radar_9531204/TestPrintfAfterUp.py

@@ -13,7 +13,6 @@ class Radar9531204TestCase(TestBase):
     mydir = TestBase.compute_mydir(__file__)
 
     # rdar://problem/9531204
-    @expectedFailureFreeBSD('llvm.org/pr17183')
     def test_expr_commands(self):
         """The evaluating printf(...) after break stop and then up a stack frame."""
         self.buildDefault()