sfxge: Do no allow EFSYS_MEM_ALLOC sleep

Andrew Rybchenko Andrew.Rybchenko at oktetlabs.ru
Tue May 20 10:09:25 UTC 2014

It solves locking problem when EFSYS_MEM_ALLOC is called in
the context holding a mutex (not allowed to sleep).
E.g. on interface bring up or multicast addresses addition.
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