makes ps2pdf work.

This fix is entirely due to rsc who emailed me the change,
I am only submitting it to push it into the distribution
in case it gets lost.

-Steve

Reference: /n/sources/patch/applied/ps2pdf-fixed
Date: Wed Aug 29 00:28:30 CES 2007
Signed-off-by: steve@quintile.net

--- /sys/src/cmd/gs/src/gshtscr.c	Wed Aug 29 00:23:55 2007
+++ /sys/src/cmd/gs/src/gshtscr.c	Wed Aug 29 00:23:50 2007
@@ -604,7 +604,7 @@
 
 	if (value < -1.0 || value > 1.0)
 	    return_error(gs_error_rangecheck);
-	sample = (int) (value * max_ht_sample) + max_ht_sample;
+	sample = (long long) (value * max_ht_sample) + max_ht_sample;
 #ifdef DEBUG
 	if (gs_debug_c('H')) {
 	    gs_point pt;