LU-8119 osd: remove dcb entry from the list prior processing.

LU-8119 osd: remove dcb entry from the list prior processing.

The osd_trans_commit_cb() processes list of commit callbacks
but there is list_del_init() missed prior calling dcb_func().
The dcb_func() call frees dcb entry itself, so list head become
corrupted. Patch adds this list_del_init().

Signed-off-by: Mikhal Pershin <mike.pershin@intel.com>
Change-Id: I561add170f408a7d16631424218b2a049d81f4fd
Reviewed-on: https://review.whamcloud.com/24202
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>