hibernate-util: de-duplicate clear_efi_hibernate_location

src/shared/hibernate-util.c

@@ -506,3 +506,14 @@ int write_resume_config(dev_t devno, uint64_t offset, const char *device) {
 
         return 0;
 }
+
+void clear_efi_hibernate_location_and_warn(void) {
+        int r;
+
+        if (!is_efi_boot())
+                return;
+
+        r = efi_set_variable(EFI_SYSTEMD_VARIABLE(HibernateLocation), NULL, 0);
+        if (r < 0)
+                log_warning_errno(r, "Failed to clear EFI variable HibernateLocation, ignoring: %m");
+}

src/shared/hibernate-util.h

@@ -22,5 +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);
+
 /* Only for test-fiemap */
 int read_fiemap(int fd, struct fiemap **ret);