luci-mod-status: improve lease state format detection

Use hasSystemFeature to distinguish dnsmasqs lease state format

Signed-off-by: nettnikl <niklas.j.nett@disroot.org>

Author: nettnikl

libs/rpcd-mod-luci/src/luci.c

@@ -526,15 +526,11 @@ lease_next(void)
 				if (n < 0) {
 					e.expire = -1;  // unlimited
 				} else {
-					// If n looks like a relative duration (< ~3 years in seconds), treat as relative
-					// This happens if dnsmasq has the HAVE_BROKEN_RTC flag set
-					int relative_expire = (n > 0 && n < 100000000);
-					
-					if (relative_expire) {
-						// n is a relative duration in seconds
+					if (L.hasSystemFeature('dnsmasq', 'rtc')) {
+						// If RTC is disabled, n is a relative duration in seconds
 						e.expire = n;   // already relative, pass through as-is
 					} else {
-						// n is an absolute timestamp
+						// If hardware times are trusted, n is an absolute timestamp
 						if (n > lease_state.now)
 							e.expire = n - lease_state.now;
 						else if (n >= 0)