ext4: quiet 'unused variables' compile warnings

Unused variables was deleted.
Signed-off-by: NYongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/extents.c

@@ -3073,12 +3073,10 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
 					      struct ext4_ext_path *path)
 {
 	struct ext4_extent *ex;
-	struct ext4_extent_header *eh;
 	int depth;
 	int err = 0;
 
 	depth = ext_depth(inode);
-	eh = path[depth].p_hdr;
 	ex = path[depth].p_ext;
 
 	ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical"

fs/ext4/mballoc.c

@@ -4666,12 +4666,10 @@ void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
 	struct ext4_buddy e4b;
 	int err = 0, ret, blk_free_count;
 	ext4_grpblk_t blocks_freed;
-	struct ext4_group_info *grp;
 
 	ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1);
 
 	ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
-	grp = ext4_get_group_info(sb, block_group);
 	/*
 	 * Check to see if we are freeing blocks across a group
 	 * boundary.