Remove trailing spaces [ci skip]

[ This is a backport to the 2.2 branch. ]

(cherry picked from commit 942bb13)

Author: nobu

lib/openssl/buffering.rb

@@ -31,7 +31,7 @@ def initialize
 
       force_encoding(BINARY)
     end
-    
+
     def << string
       if string.encoding == BINARY
         super(string)

lib/openssl/ssl.rb

@@ -236,7 +236,7 @@ module SocketForwarder
       def fileno
         to_io.fileno
       end
-      
+
       def addr
         to_io.addr
       end