src/chage.c: print_day_as_date(): Handle errors from strfime(3)

Just like we do in day_to_str().

Signed-off-by: Alejandro Colomar <alx@kernel.org>

src/chage.c

@@ -247,7 +247,11 @@ print_day_as_date(long day)
 		return;
 	}
 
-	STRFTIME(buf, iflg ? "%F" : "%b %d, %Y", &tm);
+	if (STRFTIME(buf, iflg ? "%F" : "%b %d, %Y", &tm) == 0) {
+		puts(_("future"));
+		return;
+	}
+
 	(void) puts (buf);
 }