core: make gc_marker unsigned (#7004)

This matches the definition in unit.h.

diff --git a/src/core/manager.h b/src/core/manager.h
index ff73fb3e85d3cc5b91d6bcfabb8960189d5ff808..6fff7b2437c9fcf93b2f338fc7cadd5bea33bbac 100644 (file)
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -244,7 +244,7 @@ struct Manager {
          * file system */
         int pin_cgroupfs_fd;
 
-        int gc_marker;
+        unsigned gc_marker;
 
         /* Flags */
         ManagerExitCode exit_code:5;