tracefs: Fix inode allocation

tracefs: Fix inode allocation

The leading comment above alloc_inode_sb() is pretty explicit about it:

  /*
   * This must be used for allocating filesystems specific inodes to set
   * up the inode reclaim context correctly.
   */

Switch tracefs over to alloc_inode_sb() to make sure inodes are properly
linked.

Cc: Ajay Kaher <ajay.kaher@broadcom.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/20240807115143.45927-2-minipli@grsecurity.net
Fixes: ba37ff75e04b ("eventfs: Implement tracefs_inode_cache")
Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>