jfs: clean up some compiler warnings

jfs has a few variables being set but never used.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 03787ef..45e5c6f 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -893,7 +893,7 @@
 	unchar *i_fastsymlink;
 	s64 xlen = 0;
 	int bmask = 0, xsize;
-	s64 extent = 0, xaddr;
+	s64 xaddr;
 	struct metapage *mp;
 	struct super_block *sb;
 	struct tblock *tblk;
@@ -993,7 +993,6 @@
 			txAbort(tid, 0);
 			goto out3;
 		}
-		extent = xaddr;
 		ip->i_size = ssize - 1;
 		while (ssize) {
 			/* This is kind of silly since PATH_MAX == 4K */