[epiphany] Update HACKING.md to tweak the braces rule for one-line control clauses

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 94af7dc187538c4551fc925cb6caf44be37c9c41
Author: Michael Catanzaro <mcatanzaro posteo net>
Date:   Wed Dec 19 23:34:10 2018 +0000

    Update HACKING.md to tweak the braces rule for one-line control clauses

 HACKING.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/HACKING.md b/HACKING.md
index 31e8ca572..2ca51879c 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -16,7 +16,8 @@ need to stick to in order to get your patch accepted:
 
  * Use K&R style for the braces.
 
- * No braces for one line control clauses.
+ * No braces for one line control clauses except when another clause in the
+   chain contains more than one line.
 
  * Callback functions have a suffix _cb.