* posix/regexec.c (transit_state): Don't handle state == NULL.
Move state log and backreference management...
(merge_state_with_log): ... to this function.
(find_recover_state): New function.
(check_matching): Use find_recover_state to get a non-NULL
state when an invalid state is reached. Compute the amount
of initial characters to be skipped less conservatively when
multi-byte character sets are in use. Do not check
dfa->nbackref if the state log is NULL. Initialize err.
(acquire_init_state_context): Expect err to be initialized.
Fix spacing.