libudev: fix return of udev_monitor_filter_add_match_subsystem_devtype()

Follow-up for 7117842657c0fc5a3446b6fe158615279cf2d650.

sd_device_monitor_filter_add_match_subsystem_devtype() now returns 1 to signify
that something was done, and 0 to signify that nothing was done, but
udev_monitor_filter_add_match_subsystem_devtype() needs to return 0 as documented.

udev_monitor_filter_add_match_tag() is adjusted to match.

This makes gdm start successfully here again.
Before, it would just not boot, with nothing very obvious in the logs:
gdm[1756]: Gdm: GdmDisplay: Session never registered, failing

Replaces #19171.

diff --git a/src/libudev/libudev-monitor.c b/src/libudev/libudev-monitor.c
index 4ddcf95d05f57300c7b62b75e2c245a304de3515..d7c931d9f929d42d47a86b744781fa869d48683c 100644 (file)
--- a/src/libudev/libudev-monitor.c
+++ b/src/libudev/libudev-monitor.c
@@ -265,9 +265,12 @@ _public_ struct udev_device *udev_monitor_receive_device(struct udev_monitor *ud
  * Returns: 0 on success, otherwise a negative error value.
  */
 _public_ int udev_monitor_filter_add_match_subsystem_devtype(struct udev_monitor *udev_monitor, const char *subsystem, const char *devtype) {
+        int r;
+
         assert_return(udev_monitor, -EINVAL);
 
-        return sd_device_monitor_filter_add_match_subsystem_devtype(udev_monitor->monitor, subsystem, devtype);
+        r = sd_device_monitor_filter_add_match_subsystem_devtype(udev_monitor->monitor, subsystem, devtype);
+        return r < 0 ? r : 0;
 }
 
 /**
@@ -283,9 +286,12 @@ _public_ int udev_monitor_filter_add_match_subsystem_devtype(struct udev_monitor
  * Returns: 0 on success, otherwise a negative error value.
  */
 _public_ int udev_monitor_filter_add_match_tag(struct udev_monitor *udev_monitor, const char *tag) {
+        int r;
+
         assert_return(udev_monitor, -EINVAL);
 
-        return sd_device_monitor_filter_add_match_tag(udev_monitor->monitor, tag);
+        r = sd_device_monitor_filter_add_match_tag(udev_monitor->monitor, tag);
+        return r < 0 ? r : 0;
 }
 
 /**