spufs: fix a crash in spufs_create_root()

The spu_fs_context was not set in fc->fs_private, this caused a crash
when accessing ctx->mode in spufs_create_root().

Fixes: d2e0981 ("vfs: Convert spufs to use the new mount API")
Signed-off-by: Emmanuel Nicolet <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: CheezeCake

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

@@ -761,6 +761,7 @@ static int spufs_init_fs_context(struct fs_context *fc)
 	ctx->gid = current_gid();
 	ctx->mode = 0755;
 
+	fc->fs_private = ctx;
 	fc->s_fs_info = sbi;
 	fc->ops = &spufs_context_ops;
 	return 0;