bug#15344: 24.3; Crash when yanking in c-mode

[Daniel Colascione <dancol@dancol.org>]

On 01/13/2014 05:39 AM, Thien-Thi Nguyen wrote:
> Here is a script to make debugging easier:

Thanks. Does this patch have any unwanted side effects? It seems 
perfectly reasonable to me that we could reach the end of the interval 
tree without finding anything to modify or going past our bound.

=== modified file 'src/textprop.c'
--- src/textprop.c	2014-01-01 07:43:34 +0000
+++ src/textprop.c	2014-01-13 13:56:18 +0000
@@ -1741,6 +1741,8 @@
  	}
        len -= LENGTH (i);
        i = next_interval (i);
+      if (!i)
+        return Qnil;
      }
  }