[gnome-terminal] screen: Remove bogus return value

[Egmont Koblinger <egmontkob src gnome org>]

commit 4161dbbb2091c1fa0dd57f86b89955569f2e998d
Author: Ting-Wei Lan <lantw44 gmail com>
Date:   Fri Oct 30 08:04:12 2015 +0100

    screen: Remove bogus return value
    
    https://bugzilla.gnome.org/show_bug.cgi?id=757314

 src/terminal-screen.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/src/terminal-screen.c b/src/terminal-screen.c
index 6eae7ab..6caaf47 100644
--- a/src/terminal-screen.c
+++ b/src/terminal-screen.c
@@ -1972,8 +1972,6 @@ terminal_screen_check_extra (TerminalScreen *screen,
             }
         }
     }
-
-  return NULL;
 }
 
 /**