Work around HPUX /bin/cc compiler bug.

(card_of_complement): Use cleaner `sizeof in_set'
rather than `N_CHARS * sizeof(in_set[0])'.  Using HPUX's /bin/cc
(aC++/ANSI C B3910B A.05.55 [Dec 04 2003]) on an ia64-hp-hpux11.22
system, those two expressions are not the same (256 vs. 1024).
The effect of this problem was that `tr -c x y' would fail:
tr: when not truncating set1, string2 must be non-empty

1 files changed, 1 insertions, 1 deletions

diff --git a/src/tr.c b/src/tr.c
index 366b21710..88f72422b 100644
--- a/src/tr.c
+++ b/src/tr.c
@@ -1274,7 +1274,7 @@ card_of_complement (struct Spec_list *s)
   int cardinality = N_CHARS;
   SET_TYPE in_set[N_CHARS];
 
-  memset (in_set, 0, N_CHARS * sizeof (in_set[0]));
+  memset (in_set, 0, sizeof in_set);
   s->state = BEGIN_STATE;
   while ((c = get_next (s, NULL)) != -1)
     if (!in_set[c]++)