cifs: clean up call to cifs_dfs_release_automount_timer()

Take the #ifdef junk out of the code, and turn it into a noop macro
when CONFIG_CIFS_DFS_UPCALL isn't defined.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsfs.c

@@ -1177,9 +1177,7 @@ exit_cifs(void)
 	cFYI(DBG2, "exit_cifs");
 	cifs_proc_clean();
 	cifs_fscache_unregister();
-#ifdef CONFIG_CIFS_DFS_UPCALL
 	cifs_dfs_release_automount_timer();
-#endif
 #ifdef CONFIG_CIFS_ACL
 	cifs_destroy_idmaptrees();
 	exit_cifs_idmap();

fs/cifs/cifsproto.h

@@ -171,7 +171,13 @@ extern struct smb_vol *cifs_get_volume_info(char *mount_data,
 					    const char *devname);
 extern int cifs_mount(struct cifs_sb_info *, struct smb_vol *);
 extern void cifs_umount(struct cifs_sb_info *);
+
+#if IS_ENABLED(CONFIG_CIFS_DFS_UPCALL)
 extern void cifs_dfs_release_automount_timer(void);
+#else /* ! IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) */
+#define cifs_dfs_release_automount_timer()	do { } while (0)
+#endif /* ! IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) */
+
 void cifs_proc_init(void);
 void cifs_proc_clean(void);