eventfs: Use SRCU for freeing eventfs_inodes

eventfs: Use SRCU for freeing eventfs_inodes

To mirror the SRCU lock held in eventfs_iterate() when iterating over
eventfs inodes, use call_srcu() to free them too.

This was accidentally(?) degraded to RCU in commit 43aa6f97c2d0
("eventfs: Get rid of dentry pointers without refcounts").

Cc: Ajay Kaher <ajay.kaher@broadcom.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/20240723210755.8970-1-minipli@grsecurity.net
Fixes: 43aa6f97c2d0 ("eventfs: Get rid of dentry pointers without refcounts")
Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>