ntfs: remove redundant initialization to pointer cb_sb_start

The pointer cb_sb_start is being initialized with a value that is never
read, it is being re-assigned the same value later on when it is first
being used. The initialization is redundant and can be removed.

Cleans up clang scan build warning:
fs/ntfs/compress.c:164:6: warning: Value stored to 'cb_sb_start' during its initialization is never read [deadcode.DeadStores]
        u8 *cb_sb_start = cb;   /* Beginning of the current sb in the cb. */
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Message-Id: <20230418153607.3125704-1-colin.i.king@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/ntfs/compress.c

@@ -161,7 +161,7 @@ static int ntfs_decompress(struct page *dest_pages[], int completed_pages[],
 	 */
 	u8 *cb_end = cb_start + cb_size; /* End of cb. */
 	u8 *cb = cb_start;	/* Current position in cb. */
-	u8 *cb_sb_start = cb;	/* Beginning of the current sb in the cb. */
+	u8 *cb_sb_start;	/* Beginning of the current sb in the cb. */
 	u8 *cb_sb_end;		/* End of current sb / beginning of next sb. */
 
 	/* Variables for uncompressed data / destination. */