Remove trailing whitespace in test suite. Approved by Marshall Clow.

llvm-svn: 271435
diff --git a/libcxx/test/std/experimental/string.view/string.view.capacity/capacity.pass.cpp b/libcxx/test/std/experimental/string.view/string.view.capacity/capacity.pass.cpp
index eb80216..ed4d009 100644
--- a/libcxx/test/std/experimental/string.view/string.view.capacity/capacity.pass.cpp
+++ b/libcxx/test/std/experimental/string.view/string.view.capacity/capacity.pass.cpp
@@ -30,7 +30,7 @@
     static_assert ( sv1.max_size() > sv1.size(), "");
     }
 #endif
-    
+
     {
     SV sv1;
     assert ( sv1.size() == 0 );