Bug in mask_proc()

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Hi,

there is a bug in the mask_proc() function in event.c:
A dazukofs_proc structure is allocated on the stack and put into a 
global list.
This might lead to corrupted data since the stack location of the struct 
might
be overwritten in future.
This patch uses heap memory instead of stack memory. Since the proc struct
is allocated and freed frequently,  a memory cache is used.

This patch also adds some missing includes in file.c and ign_dev.c.

@John
I also saw that the event allocation and releasing is unnecessary 
complicate
(see release_event()). Should we not use a real ref counting mechanism that
ensures memory freeing when the last reference to the event is released?
 

Regards,
Lino

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