ocfs2: remove kfree() redundant null checks

smatch analysis indicates a number of redundant NULL checks before
calling kfree(), eg:

  fs/ocfs2/alloc.c:6138 ocfs2_begin_truncate_log_recovery() info:
   redundant null check on *tl_copy calling kfree()

  fs/ocfs2/alloc.c:6755 ocfs2_zero_range_for_truncate() info:
   redundant null check on pages calling kfree()

etc....

[akpm@linux-foundation.org: revert dubious change in ocfs2_begin_truncate_log_recovery()]
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/alloc.c

@@ -6751,7 +6751,6 @@ int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
 		mlog_errno(ret);
 
 out:
-	if (pages)
 	kfree(pages);
 
 	return ret;

fs/ocfs2/cluster/heartbeat.c

@@ -1471,7 +1471,6 @@ static void o2hb_region_release(struct config_item *item)
 
 	mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name);
 
-	if (reg->hr_tmp_block)
 	kfree(reg->hr_tmp_block);
 
 	if (reg->hr_slot_data) {
@@ -1486,7 +1485,6 @@ static void o2hb_region_release(struct config_item *item)
 	if (reg->hr_bdev)
 		blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
 
-	if (reg->hr_slots)
 	kfree(reg->hr_slots);
 
 	kfree(reg->hr_db_regnum);

fs/ocfs2/cluster/tcp.c

@@ -1165,9 +1165,7 @@ int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
 	o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
 	if (sc)
 		sc_put(sc);
-	if (vec)
 	kfree(vec);
-	if (msg)
 	kfree(msg);
 	o2net_complete_nsw(nn, &nsw, 0, 0, 0);
 	return ret;

fs/ocfs2/dlm/dlmdomain.c

@@ -319,9 +319,7 @@ static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
 	if (dlm->master_hash)
 		dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
 
-	if (dlm->name)
 	kfree(dlm->name);
-
 	kfree(dlm);
 }
 

fs/ocfs2/extent_map.c

@@ -282,7 +282,6 @@ void ocfs2_extent_map_insert_rec(struct inode *inode,
 	spin_unlock(&oi->ip_lock);
 
 out:
-	if (new_emi)
 	kfree(new_emi);
 }
 

fs/ocfs2/journal.c

@@ -1234,10 +1234,7 @@ static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal,
 		/* Though we wish to avoid it, we are in fact safe in
 		 * skipping local alloc cleanup as fsck.ocfs2 is more
 		 * than capable of reclaiming unused space. */
-		if (la_dinode)
 		kfree(la_dinode);
-
-		if (tl_dinode)
 		kfree(tl_dinode);
 
 		if (qrec)
@@ -1408,7 +1405,6 @@ static int __ocfs2_recovery_thread(void *arg)
 
 	mutex_unlock(&osb->recovery_lock);
 
-	if (rm_quota)
 	kfree(rm_quota);
 
 	/* no one is callint kthread_stop() for us so the kthread() api

fs/ocfs2/localalloc.c

@@ -476,7 +476,6 @@ void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
 	if (local_alloc_inode)
 		iput(local_alloc_inode);
 
-	if (alloc_copy)
 	kfree(alloc_copy);
 }
 
@@ -534,7 +533,7 @@ int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
 		mlog_errno(status);
 
 bail:
-	if ((status < 0) && (*alloc_copy)) {
+	if (status < 0) {
 		kfree(*alloc_copy);
 		*alloc_copy = NULL;
 	}
@@ -1290,7 +1289,6 @@ static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
 	if (main_bm_inode)
 		iput(main_bm_inode);
 
-	if (alloc_copy)
 	kfree(alloc_copy);
 
 	if (ac)

fs/ocfs2/stack_o2cb.c

@@ -376,7 +376,7 @@ static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
 	dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
 
 out_free:
-	if (rc && conn->cc_private)
+	if (rc)
 		kfree(conn->cc_private);
 
 out:

fs/ocfs2/super.c

@@ -2525,7 +2525,6 @@ static int ocfs2_check_volume(struct ocfs2_super *osb)
 		mlog_errno(status);
 
 finally:
-	if (local_alloc)
 	kfree(local_alloc);
 
 	if (status)
@@ -2553,7 +2552,6 @@ static void ocfs2_delete_osb(struct ocfs2_super *osb)
 	 * we free it here.
 	 */
 	kfree(osb->journal);
-	if (osb->local_alloc_copy)
 	kfree(osb->local_alloc_copy);
 	kfree(osb->uuid_str);
 	ocfs2_put_dlm_debug(osb->osb_dlm_debug);

fs/ocfs2/sysfile.c

@@ -91,7 +91,6 @@ static struct inode **get_local_system_inode(struct ocfs2_super *osb,
 		} else
 			osb->local_system_inodes = local_system_inodes;
 		spin_unlock(&osb->osb_lock);
-		if (unlikely(free))
 		kfree(free);
 	}