ext4: remove unused variable

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index a6132a7..b4cbee9 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -405,14 +405,12 @@
 {
 	struct page *data_page = NULL;
 	struct inode *inode = page->mapping->host;
-	unsigned block_start, blocksize;
+	unsigned block_start;
 	struct buffer_head *bh, *head;
 	int ret = 0;
 	int nr_submitted = 0;
 	int nr_to_submit = 0;
 
-	blocksize = 1 << inode->i_blkbits;
-
 	BUG_ON(!PageLocked(page));
 	BUG_ON(PageWriteback(page));