Prevent screen flickering (standalone info)

[Gavin Smith]

Moving the cursor around causes some screen flickering. This patch stops this.

display.c (find_diff): Return values other than 0.

--- a/display.c
+++ b/display.c
@@ -102,7 +102,7 @@ find_diff (const char *a, size_t alen, const char
*b, size_t blen, int *ppos)

   for (i = 0, mbi_init (itra, a, alen), mbi_init (itrb, b, blen);
        mbi_avail (itra) && mbi_avail (itrb);
-       mbi_advance (itra), mbi_advance (itrb))
+       i++, mbi_advance (itra), mbi_advance (itrb))
     {
       if (mb_cmp (mbi_cur (itra), mbi_cur (itrb)))
        break;