Fix Windows build.

Now that 11c0f8e54c has landed, none of
the cases of the switch in |ssl3_ctrl| ever break and so the “return 1”
at the end of the function is unreachable. MSVC is unhappy about that.

Change-Id: I001dc63831ba60d93b622ac095297e2febc5f078

ssl/s3_lib.c

@@ -467,8 +467,6 @@ long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg) {
     default:
       return 0;
   }
-
-  return 1;
 }
 
 int SSL_CTX_set_tlsext_servername_callback(