[libcxx] [test] Strip trailing whitespace. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@346826 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/views/span.objectrep/as_bytes.pass.cpp

@@ -7,7 +7,7 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===---------------------------------------------------------------------===//
-// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
 
 // <span>
 
@@ -38,7 +38,7 @@ void testRuntimeSpan(Span sp)
         assert(spBytes.extent == std::dynamic_extent);
     else
         assert(spBytes.extent == static_cast<std::ptrdiff_t>(sizeof(typename Span::element_type)) * sp.extent);
-        
+
     assert((void *) spBytes.data() == (void *) sp.data());
     assert(spBytes.size() == sp.size_bytes());
 }