fix "variable 'foo' set but not used" warnings

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/miscutils/last_fancy.c b/miscutils/last_fancy.c
index 7e61b76..dc09b65 100644
--- a/miscutils/last_fancy.c
+++ b/miscutils/last_fancy.c
@@ -161,11 +161,10 @@
 	time_t boot_time;
 	time_t down_time;
 	int file;
-	unsigned opt;
 	smallint going_down;
 	smallint boot_down;
 
-	opt = getopt32(argv, "Wf:" /* "H" */, &filename);
+	/*opt =*/ getopt32(argv, "Wf:" /* "H" */, &filename);
 #ifdef BUT_UTIL_LINUX_LAST_HAS_NO_SUCH_OPT
 	if (opt & LAST_OPT_H) {
 		/* Print header line */