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/node.c b/fs/f2fs/node.c
index 4b697cc..de709f0 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -845,7 +845,7 @@
 	truncate_node(&dn);
 }
 
-struct page *new_inode_page(struct inode *inode, const struct qstr *name)
+struct page *new_inode_page(struct inode *inode)
 {
 	struct dnode_of_data dn;