hibernate-util: make clear_efi_hibernate_location_and_warn return 1 if

actually cleared the variable

src/hibernate-resume/hibernate-resume.c

@@ -60,7 +60,7 @@ static int run(int argc, char *argv[]) {
                         return r;
 
                 if (arg_info.efi)
-                        clear_efi_hibernate_location_and_warn();
+                        (void) clear_efi_hibernate_location_and_warn();
         }
 
         if (stat(arg_info.device, &st) < 0)

src/shared/hibernate-util.c

@@ -513,13 +513,17 @@ int write_resume_config(dev_t devno, uint64_t offset, const char *device) {
         return 0;
 }
 
-void clear_efi_hibernate_location_and_warn(void) {
+int clear_efi_hibernate_location_and_warn(void) {
         int r;
 
         if (!is_efi_boot())
-                return;
+                return 0;
 
         r = efi_set_variable(EFI_SYSTEMD_VARIABLE(HibernateLocation), NULL, 0);
+        if (r == -ENOENT)
+                return 0;
         if (r < 0)
-                log_warning_errno(r, "Failed to clear EFI variable HibernateLocation, ignoring: %m");
+                return log_warning_errno(r, "Failed to clear EFI variable HibernateLocation: %m");
+
+        return 1;
 }

src/shared/hibernate-util.h

@@ -22,7 +22,7 @@ int hibernation_is_safe(void);
 
 int write_resume_config(dev_t devno, uint64_t offset, const char *device);
 
-void clear_efi_hibernate_location_and_warn(void);
+int clear_efi_hibernate_location_and_warn(void);
 
 /* Only for test-fiemap */
 int read_fiemap(int fd, struct fiemap **ret);

src/sleep/sleep.c

@@ -308,7 +308,7 @@ static int execute(
 
 fail:
         if (SLEEP_OPERATION_IS_HIBERNATION(operation))
-                clear_efi_hibernate_location_and_warn();
+                (void) clear_efi_hibernate_location_and_warn();
 
         return r;
 }