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

llvm-svn: 271435
diff --git a/libcxx/test/std/containers/sequences/array/indexing.pass.cpp b/libcxx/test/std/containers/sequences/array/indexing.pass.cpp
index 5ccb0b4..64d2716 100644
--- a/libcxx/test/std/containers/sequences/array/indexing.pass.cpp
+++ b/libcxx/test/std/containers/sequences/array/indexing.pass.cpp
@@ -33,7 +33,7 @@
         assert(r1 == 1);
         r1 = 5.5;
         assert(c.front() == 5.5);
-        
+
         C::reference r2 = c[2];
         assert(r2 == 3.5);
         r2 = 7.5;