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

llvm-svn: 271435
diff --git a/libcxx/test/std/experimental/string.view/string.view.access/index.pass.cpp b/libcxx/test/std/experimental/string.view/string.view.access/index.pass.cpp
index 4491207..de4bb8d 100644
--- a/libcxx/test/std/experimental/string.view/string.view.access/index.pass.cpp
+++ b/libcxx/test/std/experimental/string.view/string.view.access/index.pass.cpp
@@ -24,7 +24,7 @@
         assert ( &sv[i] == s + i );
         }
     }
-    
+
 int main () {
     test ( "ABCDE", 5 );
     test ( "a", 1 );