ext4: remove unnecessary NULL pointer check

brelse() and ext4_journal_force_commit() are both inlined and able
to handle NULL.
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/namei.c

@@ -2110,8 +2110,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
 journal_error:
 	ext4_std_error(dir->i_sb, err);
 cleanup:
-	if (bh)
-		brelse(bh);
+	brelse(bh);
 	dx_release(frames);
 	return err;
 }

fs/ext4/super.c

@@ -4480,16 +4480,12 @@ static void ext4_clear_journal_err(struct super_block *sb,
 int ext4_force_commit(struct super_block *sb)
 {
 	journal_t *journal;
-	int ret = 0;
 
 	if (sb->s_flags & MS_RDONLY)
 		return 0;
 
 	journal = EXT4_SB(sb)->s_journal;
-	if (journal)
-		ret = ext4_journal_force_commit(journal);
-
-	return ret;
+	return ext4_journal_force_commit(journal);
 }
 
 static int ext4_sync_fs(struct super_block *sb, int wait)