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 <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/[email protected]
Fixes: 43aa6f97c2d0 ("eventfs: Get rid of dentry pointers without refcounts")
Signed-off-by: Mathias Krause <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>