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

llvm-svn: 271435
diff --git a/libcxx/test/std/input.output/file.streams/c.files/gets.fail.cpp b/libcxx/test/std/input.output/file.streams/c.files/gets.fail.cpp
index 60a7642..064d72c 100644
--- a/libcxx/test/std/input.output/file.streams/c.files/gets.fail.cpp
+++ b/libcxx/test/std/input.output/file.streams/c.files/gets.fail.cpp
@@ -10,7 +10,7 @@
 // UNSUPPORTED: c++98, c++03, c++11
 // test <cstdio>
 
-// gets 
+// gets
 
 #include <cstdio>