f2fs: clean up an unused parameter and assignment

This patch cleans up simple unnecessary codes.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 1994d2e..89b0bd9 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -23,14 +23,13 @@
 
 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
 {
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	nid_t ino;
 	struct inode *inode;
 	bool nid_free = false;
 	int err;
 
-	inode = new_inode(sb);
+	inode = new_inode(dir->i_sb);
 	if (!inode)
 		return ERR_PTR(-ENOMEM);
 
@@ -103,8 +102,7 @@
 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 						bool excl)
 {
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct inode *inode;
 	nid_t ino = 0;
 	int err;
@@ -147,8 +145,7 @@
 		struct dentry *dentry)
 {
 	struct inode *inode = old_dentry->d_inode;
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	int err;
 
 	f2fs_balance_fs(sbi);
@@ -208,8 +205,7 @@
 
 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 {
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct inode *inode = dentry->d_inode;
 	struct f2fs_dir_entry *de;
 	struct page *page;
@@ -243,8 +239,7 @@
 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 					const char *symname)
 {
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct inode *inode;
 	size_t symlen = strlen(symname) + 1;
 	int err;
@@ -331,8 +326,7 @@
 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 				umode_t mode, dev_t rdev)
 {
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct inode *inode;
 	int err = 0;
 
@@ -370,8 +364,7 @@
 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry)
 {
-	struct super_block *sb = old_dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(old_dir->i_sb);
 	struct inode *old_inode = old_dentry->d_inode;
 	struct inode *new_inode = new_dentry->d_inode;
 	struct page *old_dir_page;
@@ -490,8 +483,7 @@
 
 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
-	struct super_block *sb = dir->i_sb;
-	struct f2fs_sb_info *sbi = F2FS_SB(sb);
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct inode *inode;
 	int err;