Fix incorrect error handling in PAM policy parser. [SA-14:13]
MFC r266605.

Move mutex creation from ipf_log_soft_init() to ipf_log_soft_create()
to be consistent with mutex destruction in ipf_log_soft_destroy(). As a
result mutex destruction in ipf_log_soft_fini() is redundant.

Approved by:	glebius (mentor)