[libsigcplusplus] Make a comment easier to reformat.

[Murray Cumming <murrayc src gnome org>]

commit ded414399934a74c47b7480e391edb95dffa6247
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Apr 12 09:27:57 2016 +0200

    Make a comment easier to reformat.

 sigc++/signal_base.cc |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/sigc++/signal_base.cc b/sigc++/signal_base.cc
index a16490f..8d7c357 100644
--- a/sigc++/signal_base.cc
+++ b/sigc++/signal_base.cc
@@ -190,11 +190,14 @@ signal_impl::notify(notifiable* d)
     signal_exec exec(si->self_);
     si->self_->slots_.erase(si->iter_);
   }
-  else // This is occuring during signal emission or slot erasure.
-    si->self_->deferred_ =
-      true; // => sweep() will be called from ~signal_exec() after signal emission.
-  // This is safer because we don't have to care about our
-  // iterators in emit(), clear(), and erase().
+  else
+  {
+    // This is occuring during signal emission or slot erasure.
+    // => sweep() will be called from ~signal_exec() after signal emission.
+    // This is safer because we don't have to care about our
+    // iterators in emit(), clear(), and erase().
+    si->self_->deferred_ = true;
+  }
 }
 
 } /* namespace internal */