Use simpler version of sys::fs::exists. NFC.

llvm-svn: 217618
diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index 94ccab6..a009202 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -334,9 +334,7 @@
       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 
   // Make sure it exists.
-  bool TempFileExists;
-  ASSERT_NO_ERROR(sys::fs::exists(Twine(TempPath), TempFileExists));
-  EXPECT_TRUE(TempFileExists);
+  ASSERT_TRUE(sys::fs::exists(Twine(TempPath)));
 
   // Create another temp tile.
   int FD2;
@@ -363,6 +361,7 @@
   EXPECT_EQ(B.type(), fs::file_type::file_not_found);
 
   // Make sure Temp2 doesn't exist.
+  bool TempFileExists;
   ASSERT_NO_ERROR(fs::exists(Twine(TempPath2), TempFileExists));
   EXPECT_FALSE(TempFileExists);