btrfs: free-space-cache.c: remove extra semicolon.

The patch below removes an extra semicolon.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
CC: Chris Mason <chris.mason@oracle.com>
CC: linux-btrfs@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 181760f..75a7b11 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -418,7 +418,7 @@
 	}
 
 	if (index == 0)
-		offset = sizeof(u32) * io_ctl->num_pages;;
+		offset = sizeof(u32) * io_ctl->num_pages;
 
 	crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc,
 			      PAGE_CACHE_SIZE - offset);