remove stray / in include path

Summary: removing // as it could break some comment parser

Test Plan: unitz

Reviewed By: dancol@fb.com

Subscribers: trunkagent, doug, seanc, folly-diffs@, yfeldblum

FB internal diff: D1830591

Signature: t1:1830591:1423203436:9e8b28b714eb2dc080462ab3e8ce04c176df8586

folly/io/async/AsyncSSLSocket.cpp

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include <folly/io//async/AsyncSSLSocket.h>
+#include <folly/io/async/AsyncSSLSocket.h>
 
 #include <folly/io/async/EventBase.h>