[dovecot/core] 677b75: global: don't cast NULL to void *

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 677b75f90d81eafe742896d6570a2f63ce501d05
      https://github.com/dovecot/core/commit/677b75f90d81eafe742896d6570a2f63ce501d05
  Author: Josef 'Jeff' Sipek <jeff.sipek at dovecot.fi>
  Date:   2018-01-19 (Fri, 19 Jan 2018)

  Changed paths:
    M src/anvil/main.c
    M src/auth/auth-request-handler.c
    M src/auth/userdb-passwd.c
    M src/director/director-test.c
    M src/director/main.c
    M src/imap/imap-fetch-body.c
    M src/lib-http/test-http-client-errors.c
    M src/lib-http/test-http-payload.c
    M src/lib-http/test-http-server-errors.c
    M src/lib-http/test-http-server.c
    M src/lib-imap-storage/imap-msgpart.c
    M src/lib-index/mail-index-alloc-cache.c
    M src/lib-lda/mail-send.c
    M src/lib-mail/test-istream-header-filter.c
    M src/lib-smtp/test-smtp-client-errors.c
    M src/lib-smtp/test-smtp-payload.c
    M src/lib-smtp/test-smtp-server-errors.c
    M src/lib-smtp/test-smtp-submit.c
    M src/lib-storage/index/imapc/imapc-mail-fetch.c
    M src/lib-storage/index/index-mail-binary.c
    M src/lib-storage/index/index-mail.c
    M src/lib-storage/index/index-search.c
    M src/lib-storage/index/mbox/mbox-mail.c
    M src/lib/lib-signals.c
    M src/lib/test-ioloop.c
    M src/replication/replicator/replicator.c

  Log Message:
  -----------
  global: don't cast NULL to void *

NULL is guaranteed to be a void * thanks to
dd6043c05e32a8e8db1233ed711a2c74d1477a89.