powerpc/spufs: remove set but not used variable 'ctx'

arch/powerpc/platforms/cell/spufs/inode.c:201:22:
 warning: variable ctx set but not used [-Wunused-but-set-variable]

It is not used since commit 67cba9fd ("move
spu_forget() into spufs_rmdir()")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191023134423.15052-1-yuehaibing@huawei.com

arch/powerpc/platforms/cell/spufs/inode.c

@@ -198,14 +198,12 @@ static int spufs_fill_dir(struct dentry *dir,
 
 static int spufs_dir_close(struct inode *inode, struct file *file)
 {
-	struct spu_context *ctx;
 	struct inode *parent;
 	struct dentry *dir;
 	int ret;
 
 	dir = file->f_path.dentry;
 	parent = d_inode(dir->d_parent);
-	ctx = SPUFS_I(d_inode(dir))->i_ctx;
 
 	inode_lock_nested(parent, I_MUTEX_PARENT);
 	ret = spufs_rmdir(parent, dir);