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Remove an unused variable spotted by gcc 4.6.3.

[originally from svn r9682]

--- a/unruly.c

+++ b/unruly.c

@@ -1674,8 +1674,6 @@

     int x, y;

     int ink = print_mono_colour(dr, 0);

-    char buf[2];

-    buf[1] = '\0';

     for (y = 0; y < h2; y++)

         for (x = 0; x < w2; x++) {