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annotations. * src/pwconv.c, src/pwunconv.c, src/grpconv.c, src/grpunconv.c: Ignore return value of spw_rewind, pw_rewind, sgr_rewind, and gr_rewind. * lib/commonio.h: Both head and tail cannot be owned. Set tail as dependent. * src/expiry.c: Ignore return value of expire (). * src/expiry.c: The catch_signals function does not use its sig parameter. * src/userdel.c: Last audit_logger parameter is a shadow_audit_result, use SHADOW_AUDIT_FAILURE instead of 0.