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tracing: Fix a NULL vs IS_ERR() bug in event_subsystem_dir()
commit 5264a2f upstream. The eventfs_create_dir() function returns error pointers, it never returns NULL. Update the check to reflect that. Link: https://lore.kernel.org/linux-trace-kernel/ff641474-84e2-46a7-9d7a-62b251a1050c@moroto.mountain Cc: Masami Hiramatsu <mhiramat@kernel.org> Fixes: 5790b1f ("eventfs: Remove eventfs_file and just use eventfs_inode") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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