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/front.pass.cpp b/libcxx/test/std/experimental/string.view/string.view.access/front.pass.cpp
index e9df44b..b1e0542 100644
--- a/libcxx/test/std/experimental/string.view/string.view.access/front.pass.cpp
+++ b/libcxx/test/std/experimental/string.view/string.view.access/front.pass.cpp
@@ -22,7 +22,7 @@
     assert ( sv.front() == s[0] );
     return &sv.front() == s;
     }
-    
+
 int main () {
     assert ( test ( "ABCDE", 5 ));
     assert ( test ( "a", 1 ));