ocfs2: remove unused pointer 'eb'

Pointer 'eb' is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'eb' set but not used [-Wunused-but-set-variable]

Link: http://lkml.kernel.org/r/20180828141907.10826-1-colin.king@canonical.comSigned-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/alloc.c

@@ -5106,8 +5106,6 @@ int ocfs2_split_extent(handle_t *handle,
 	 * rightmost extent list.
 	 */
 	if (path->p_tree_depth) {
-		struct ocfs2_extent_block *eb;
-
 		ret = ocfs2_read_extent_block(et->et_ci,
 					      ocfs2_et_get_last_eb_blk(et),
 					      &last_eb_bh);
@@ -5115,8 +5113,6 @@ int ocfs2_split_extent(handle_t *handle,
 			mlog_errno(ret);
 			goto out;
 		}
-
-		eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
 	}
 
 	if (rec->e_cpos == split_rec->e_cpos &&